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v4.0
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< button class = "btn btn-link bd-search-docs-toggle d-md-none p-0 ml-3" type = "button" data-toggle = "collapse" data-target = "#bd-docs-nav" aria-controls = "bd-docs-nav" aria-expanded = "false" aria-label = "Toggle docs navigation" > < svg xmlns = "http://www.w3.org/2000/svg" viewbox = "0 0 30 30" width = "30" height = "30" focusable = "false" > < title > Menu< / title > < path stroke = "currentColor" stroke-width = "2" stroke-linecap = "round" stroke-miterlimit = "10" d = "M4 7h22M4 15h22M4 23h22" / > < / svg >
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< nav class = "collapse bd-links" id = "bd-docs-nav" > < div class = "bd-toc-item" >
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< a class = "bd-toc-link" href = "/docs/4.0/getting-started/introduction/" >
Getting started
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< ul class = "nav bd-sidenav" > < li >
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< a href = "/docs/4.0/getting-started/introduction/" >
Introduction
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Download
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< a href = "/docs/4.0/getting-started/contents/" >
Contents
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< a href = "/docs/4.0/getting-started/browsers-devices/" >
Browsers & devices
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< a href = "/docs/4.0/getting-started/javascript/" >
JavaScript
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< a href = "/docs/4.0/getting-started/theming/" >
Theming
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< a href = "/docs/4.0/getting-started/build-tools/" >
Build tools
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< a href = "/docs/4.0/getting-started/webpack/" >
Webpack
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< a href = "/docs/4.0/getting-started/accessibility/" >
Accessibility
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< a class = "bd-toc-link" href = "/docs/4.0/layout/overview/" >
Layout
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< ul class = "nav bd-sidenav" > < li class = "active bd-sidenav-active" >
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< a href = "/docs/4.0/layout/overview/" >
Overview
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< a href = "/docs/4.0/layout/grid/" >
Grid
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< a href = "/docs/4.0/layout/media-object/" >
Media object
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< a href = "/docs/4.0/layout/utilities-for-layout/" >
Utilities for layout
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Content
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< ul class = "nav bd-sidenav" > < li >
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< a href = "/docs/4.0/content/reboot/" >
Reboot
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< a href = "/docs/4.0/content/typography/" >
Typography
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< a href = "/docs/4.0/content/code/" >
Code
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< a href = "/docs/4.0/content/images/" >
Images
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< a href = "/docs/4.0/content/tables/" >
Tables
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< a href = "/docs/4.0/content/figures/" >
Figures
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< a class = "bd-toc-link" href = "/docs/4.0/components/alerts/" >
Components
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< ul class = "nav bd-sidenav" > < li >
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< a href = "/docs/4.0/components/alerts/" >
Alerts
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< a href = "/docs/4.0/components/badge/" >
Badge
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< a href = "/docs/4.0/components/breadcrumb/" >
Breadcrumb
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< a href = "/docs/4.0/components/buttons/" >
Buttons
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< a href = "/docs/4.0/components/button-group/" >
Button group
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< a href = "/docs/4.0/components/card/" >
Card
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/carousel/" >
Carousel
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/collapse/" >
Collapse
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< a href = "/docs/4.0/components/dropdowns/" >
Dropdowns
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< a href = "/docs/4.0/components/forms/" >
Forms
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< a href = "/docs/4.0/components/input-group/" >
Input group
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< a href = "/docs/4.0/components/jumbotron/" >
Jumbotron
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< a href = "/docs/4.0/components/list-group/" >
List group
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< a href = "/docs/4.0/components/modal/" >
Modal
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/navs/" >
Navs
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/navbar/" >
Navbar
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/pagination/" >
Pagination
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/popovers/" >
Popovers
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/progress/" >
Progress
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/scrollspy/" >
Scrollspy
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< / a > < / li > < li >
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< a href = "/docs/4.0/components/tooltips/" >
Tooltips
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< / a > < / li > < / ul >
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< / div > < div class = "bd-toc-item" >
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< a class = "bd-toc-link" href = "/docs/4.0/utilities/borders/" >
Utilities
< / a >
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< ul class = "nav bd-sidenav" > < li >
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< a href = "/docs/4.0/utilities/borders/" >
Borders
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/clearfix/" >
Clearfix
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/close-icon/" >
Close icon
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/colors/" >
Colors
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/display/" >
Display
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/embed/" >
Embed
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/flex/" >
Flex
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/float/" >
Float
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/image-replacement/" >
Image replacement
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/position/" >
Position
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/screenreaders/" >
Screenreaders
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/sizing/" >
Sizing
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/spacing/" >
Spacing
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/text/" >
Text
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/vertical-align/" >
Vertical align
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< / a > < / li > < li >
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< a href = "/docs/4.0/utilities/visibility/" >
Visibility
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< / a > < / li > < / ul >
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< / div > < div class = "bd-toc-item" >
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< a class = "bd-toc-link" href = "/docs/4.0/extend/icons/" >
Extend
< / a >
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< ul class = "nav bd-sidenav" > < li >
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< a href = "/docs/4.0/extend/icons/" >
Icons
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< / a > < / li > < / ul >
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< / div > < div class = "bd-toc-item" >
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< a class = "bd-toc-link" href = "/docs/4.0/migration/" >
Migration
< / a >
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< ul class = "nav bd-sidenav" > < / ul >
< / div > < div class = "bd-toc-item" >
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< a class = "bd-toc-link" href = "/docs/4.0/about/overview/" >
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About
< / a >
< ul class = "nav bd-sidenav" > < li >
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< a href = "/docs/4.0/about/overview/" >
Overview
< / a > < / li > < li >
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< a href = "/docs/4.0/about/brand/" >
Brand
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< / a > < / li > < li >
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< a href = "/docs/4.0/about/license/" >
License
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< / a > < / li > < li >
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< a href = "/docs/4.0/about/translations/" >
Translations
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< / a > < / li > < / ul >
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< / div > < / nav >
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< / div >
< div class = "d-none d-xl-block col-xl-2 bd-toc" >
< ul class = "section-nav" >
< li class = "toc-entry toc-h2" > < a href = "#containers" > Containers< / a > < / li >
< li class = "toc-entry toc-h2" > < a href = "#responsive-breakpoints" > Responsive breakpoints< / a > < / li >
< li class = "toc-entry toc-h2" > < a href = "#z-index" > Z-index< / a > < / li >
< / ul >
< / div >
< main class = "col-12 col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role = "main" >
< h1 class = "bd-title" id = "content" > Overview< / h1 >
< p class = "bd-lead" > Components and options for laying out your Bootstrap project, including wrapping containers, a powerful grid system, a flexible media object, and responsive utility classes.< / p >
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< script async src = "https://cdn.carbonads.com/carbon.js?zoneid=1673&serve=C6AILKT&placement=getbootstrapcom" id = "_carbonads_js" > < / script >
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< h2 id = "containers" > Containers< / h2 >
< p > Containers are the most basic layout element in Bootstrap and are < strong > required when using our default grid system< / strong > . Choose from a responsive, fixed-width container (meaning its < code class = "highlighter-rouge" > max-width< / code > changes at each breakpoint) or fluid-width (meaning it’ < code class = "highlighter-rouge" > 100%< / code > wide all the time).< / p >
< p > While containers < em > can< / em > be nested, most layouts do not require a nested container.< / p >
< div class = "bd-example" >
< div class = "bd-example-container" >
< div class = "bd-example-container-header" > < / div >
< div class = "bd-example-container-sidebar" > < / div >
< div class = "bd-example-container-body" > < / div >
< / div >
< / div >
< figure class = "highlight" > < pre > < code class = "language-html" data-lang = "html" > < span class = "nt" > < div< / span > < span class = "na" > class=< / span > < span class = "s" > "container"< / span > < span class = "nt" > > < / span >
< span class = "c" > < !-- Content here --> < / span >
< span class = "nt" > < /div> < / span > < / code > < / pre > < / figure >
< p > Use < code class = "highlighter-rouge" > .container-fluid< / code > for a full width container, spanning the entire width of the viewport.< / p >
< div class = "bd-example" >
< div class = "bd-example-container bd-example-container-fluid" >
< div class = "bd-example-container-header" > < / div >
< div class = "bd-example-container-sidebar" > < / div >
< div class = "bd-example-container-body" > < / div >
< / div >
< / div >
< figure class = "highlight" > < pre > < code class = "language-html" data-lang = "html" > < span class = "nt" > < div< / span > < span class = "na" > class=< / span > < span class = "s" > "container-fluid"< / span > < span class = "nt" > > < / span >
...
< span class = "nt" > < /div> < / span > < / code > < / pre > < / figure >
< h2 id = "responsive-breakpoints" > Responsive breakpoints< / h2 >
< p > Since Bootstrap is developed to be mobile first, we use a handful of < a href = "https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries" > media queries< / a > to create sensible breakpoints for our layouts and interfaces. These breakpoints are mostly based on minimum viewport widths and allow us to scale up elements as the viewport changes.< / p >
< p > Bootstrap primarily uses the following media query ranges—or breakpoints—in our source Sass files for our layout, grid system, and components.< / p >
< figure class = "highlight" > < pre > < code class = "language-scss" data-lang = "scss" > < span class = "c1" > // Extra small devices (portrait phones, less than 576px)
// No media query since this is the default in Bootstrap
< / span >
< span class = "c1" > // Small devices (landscape phones, 576px and up)
< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 576px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "c1" > // Medium devices (tablets, 768px and up)
< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 768px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "c1" > // Large devices (desktops, 992px and up)
< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 992px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "c1" > // Extra large devices (large desktops, 1200px and up)
< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 1200px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span > < / code > < / pre > < / figure >
< p > Since we write our source CSS in Sass, all our media queries are available via Sass mixins:< / p >
< figure class = "highlight" > < pre > < code class = "language-scss" data-lang = "scss" > < span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-up< / span > < span class = "p" > (< / span > < span class = "n" > xs< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-up< / span > < span class = "p" > (< / span > < span class = "n" > sm< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-up< / span > < span class = "p" > (< / span > < span class = "n" > md< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-up< / span > < span class = "p" > (< / span > < span class = "n" > lg< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-up< / span > < span class = "p" > (< / span > < span class = "n" > xl< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "c1" > // Example usage:
< / span > < span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-up< / span > < span class = "p" > (< / span > < span class = "n" > sm< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "nc" > .some-class< / span > < span class = "p" > {< / span >
< span class = "nl" > display< / span > < span class = "p" > :< / span > < span class = "nb" > block< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span > < / code > < / pre > < / figure >
< p > We occasionally use media queries that go in the other direction (the given screen size < em > or smaller< / em > ):< / p >
< figure class = "highlight" > < pre > < code class = "language-scss" data-lang = "scss" > < span class = "c1" > // Extra small devices (portrait phones, less than 576px)
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 575< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
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< span class = "c1" > // Small devices (landscape phones, less than 768px)
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 767< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
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< span class = "c1" > // Medium devices (tablets, less than 992px)
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 991< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
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< span class = "c1" > // Large devices (desktops, less than 1200px)
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 1199< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
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< span class = "c1" > // Extra large devices (large desktops)
< / span > < span class = "o" > //< / span > < span class = "nt" > No< / span > < span class = "nt" > media< / span > < span class = "nt" > query< / span > < span class = "nt" > since< / span > < span class = "nt" > the< / span > < span class = "nt" > extra-large< / span > < span class = "nt" > breakpoint< / span > < span class = "nt" > has< / span > < span class = "nt" > no< / span > < span class = "nt" > upper< / span > < span class = "nt" > bound< / span > < span class = "nt" > on< / span > < span class = "nt" > its< / span > < span class = "nt" > width< / span > < / code > < / pre > < / figure >
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< div class = "bd-callout bd-callout-info" >
< p > Note that since browsers do not currently support < a href = "https://www.w3.org/TR/mediaqueries-4/#range-context" > range context queries< / a > , we work around the limitations of < a href = "https://www.w3.org/TR/mediaqueries-4/#mq-min-max" > < code class = "highlighter-rouge" > min-< / code > and < code class = "highlighter-rouge" > max-< / code > prefixes< / a > and viewports with fractional widths (which can occur under certain conditions on high-dpi devices, for instance) by using values with higher precision for these comparisons.< / p >
< / div >
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< p > Once again, these media queries are also available via Sass mixins:< / p >
< figure class = "highlight" > < pre > < code class = "language-scss" data-lang = "scss" > < span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-down< / span > < span class = "p" > (< / span > < span class = "n" > xs< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-down< / span > < span class = "p" > (< / span > < span class = "n" > sm< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-down< / span > < span class = "p" > (< / span > < span class = "n" > md< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-down< / span > < span class = "p" > (< / span > < span class = "n" > lg< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span > < / code > < / pre > < / figure >
< p > There are also media queries and mixins for targeting a single segment of screen sizes using the minimum and maximum breakpoint widths.< / p >
< figure class = "highlight" > < pre > < code class = "language-scss" data-lang = "scss" > < span class = "c1" > // Extra small devices (portrait phones, less than 576px)
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 575< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
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< span class = "c1" > // Small devices (landscape phones, 576px and up)
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 576px< / span > < span class = "p" > )< / span > < span class = "nf" > and< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 767< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
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< span class = "c1" > // Medium devices (tablets, 768px and up)
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 768px< / span > < span class = "p" > )< / span > < span class = "nf" > and< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 991< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
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< span class = "c1" > // Large devices (desktops, 992px and up)
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 992px< / span > < span class = "p" > )< / span > < span class = "nf" > and< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 1199< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
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< span class = "c1" > // Extra large devices (large desktops, 1200px and up)
< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 1200px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span > < / code > < / pre > < / figure >
< p > These media queries are also available via Sass mixins:< / p >
< figure class = "highlight" > < pre > < code class = "language-scss" data-lang = "scss" > < span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-only< / span > < span class = "p" > (< / span > < span class = "n" > xs< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-only< / span > < span class = "p" > (< / span > < span class = "n" > sm< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-only< / span > < span class = "p" > (< / span > < span class = "n" > md< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-only< / span > < span class = "p" > (< / span > < span class = "n" > lg< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span >
< span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-only< / span > < span class = "p" > (< / span > < span class = "n" > xl< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span > < / code > < / pre > < / figure >
< p > Similarly, media queries may span multiple breakpoint widths:< / p >
< figure class = "highlight" > < pre > < code class = "language-scss" data-lang = "scss" > < span class = "c1" > // Example
// Apply styles starting from medium devices and up to extra large devices
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< / span > < span class = "k" > @media< / span > < span class = "p" > (< / span > < span class = "n" > min-width< / span > < span class = "o" > :< / span > < span class = "m" > 768px< / span > < span class = "p" > )< / span > < span class = "nf" > and< / span > < span class = "p" > (< / span > < span class = "n" > max-width< / span > < span class = "o" > :< / span > < span class = "m" > 1199< / span > < span class = "mi" > .99px< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span > < / code > < / pre > < / figure >
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< p > The Sass mixin for targeting the same screen size range would be:< / p >
< figure class = "highlight" > < pre > < code class = "language-scss" data-lang = "scss" > < span class = "k" > @include< / span > < span class = "nd" > media-breakpoint-between< / span > < span class = "p" > (< / span > < span class = "n" > md< / span > < span class = "o" > ,< / span > < span class = "n" > xl< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "nc" > ...< / span > < span class = "p" > }< / span > < / code > < / pre > < / figure >
< h2 id = "z-index" > Z-index< / h2 >
< p > Several Bootstrap components utilize < code class = "highlighter-rouge" > z-index< / code > , the CSS property that helps control layout by providing a third axis to arrange content. We utilize a default z-index scale in Bootstrap that’ < / p >
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< p > These higher values start at an arbitrary number, high and specific enough to ideally avoid conflicts. We need a standard set of these across our layered components—tooltips, popovers, navbars, dropdowns, modals—so we can be reasonably consistent in the behaviors. There’ ’ < code class = "highlighter-rouge" > 100< / code > + or < code class = "highlighter-rouge" > 500< / code > +.< / p >
< p > We don’ < / p >
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< div class = "language-scss highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "nv" > $zindex-dropdown< / span > < span class = "p" > :< / span > < span class = "m" > 1000< / span > < span class = "o" > !< / span > < span class = "nb" > default< / span > < span class = "p" > ;< / span >
< span class = "nv" > $zindex-sticky< / span > < span class = "p" > :< / span > < span class = "m" > 1020< / span > < span class = "o" > !< / span > < span class = "nb" > default< / span > < span class = "p" > ;< / span >
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< span class = "nv" > $zindex-fixed< / span > < span class = "p" > :< / span > < span class = "m" > 1030< / span > < span class = "o" > !< / span > < span class = "nb" > default< / span > < span class = "p" > ;< / span >
< span class = "nv" > $zindex-modal-backdrop< / span > < span class = "p" > :< / span > < span class = "m" > 1040< / span > < span class = "o" > !< / span > < span class = "nb" > default< / span > < span class = "p" > ;< / span >
< span class = "nv" > $zindex-modal< / span > < span class = "p" > :< / span > < span class = "m" > 1050< / span > < span class = "o" > !< / span > < span class = "nb" > default< / span > < span class = "p" > ;< / span >
< span class = "nv" > $zindex-popover< / span > < span class = "p" > :< / span > < span class = "m" > 1060< / span > < span class = "o" > !< / span > < span class = "nb" > default< / span > < span class = "p" > ;< / span >
< span class = "nv" > $zindex-tooltip< / span > < span class = "p" > :< / span > < span class = "m" > 1070< / span > < span class = "o" > !< / span > < span class = "nb" > default< / span > < span class = "p" > ;< / span >
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< / code > < / pre > < / div > < / div >
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< p > To handle overlapping borders within components (e.g., buttons and inputs in input groups), we use low single digit < code class = "highlighter-rouge" > z-index< / code > values of < code class = "highlighter-rouge" > 1< / code > , < code class = "highlighter-rouge" > 2< / code > , and < code class = "highlighter-rouge" > 3< / code > for default, hover, and active states. On hover/focus/active, we bring a particular element to the forefront with a higher < code class = "highlighter-rouge" > z-index< / code > value to show their border over the sibling elements.< / p >
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< / main >
< / div >
< / div >
< script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin = "anonymous" > < / script >
< script > window . jQuery || document . write ( '<script src="/assets/js/vendor/jquery-slim.min.js"><\/script>' ) < / script >
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< script src = "/assets/js/vendor/popper.min.js" > < / script > < script src = "/dist/js/bootstrap.min.js" > < / script > < script src = "/assets/js/docs.min.js" > < / script > < script src = "https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js" > < / script >
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< script >
docsearch({
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apiKey: '48cb48b22351bc71ea5f12f4d1ede198',
indexName: 'bootstrap-v4',
inputSelector: '#search-input',
handleSelected: function (input, event, suggestion) {
var url = suggestion.url;
url = suggestion.isLvl1 ? url.split('#')[0]: url;
// If it's a title we remove the anchor so it does not jump.
window.location.href = url;
},
transformData: function (hits) {
return hits.map(function (hit) {
hit.url = hit.url.replace('https://v4-alpha.getbootstrap.com', '/docs/4.0');
return hit;
});
},
debug: false // Set debug to true if you want to inspect the dropdown
});
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< / script > < script >
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Holder.addTheme('gray', {
bg: '#777',
fg: 'rgba(255,255,255,.75)',
font: 'Helvetica',
fontweight: 'normal'
});
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< / script >
< / body >
< / html >
