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195 lines
7.5 KiB
Markdown
195 lines
7.5 KiB
Markdown
---
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layout: docs
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title: Borders
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description: Use border utilities to quickly style the border and border-radius of an element. Great for images, buttons, or any other element.
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group: utilities
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toc: true
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---
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## Border
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Use border utilities to add or remove an element's borders. Choose from all borders or one at a time.
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### Additive
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Add borders to custom elements:
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{{< example class="bd-example-border-utils" >}}
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<span class="border"></span>
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<span class="border-top"></span>
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<span class="border-end"></span>
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<span class="border-bottom"></span>
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<span class="border-start"></span>
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{{< /example >}}
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### Subtractive
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Or remove borders:
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{{< example class="bd-example-border-utils" >}}
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<span class="border border-0"></span>
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<span class="border border-top-0"></span>
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<span class="border border-end-0"></span>
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<span class="border border-bottom-0"></span>
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<span class="border border-start-0"></span>
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{{< /example >}}
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## Color
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{{< callout info >}}
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Border utilities like `.border-*` that generated from our original `$theme-colors` Sass map don't yet respond to color modes, however, any `.border-*-subtle` utility will. This will be resolved in v6.
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{{< /callout >}}
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Change the border color using utilities built on our theme colors.
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{{< example class="bd-example-border-utils" >}}
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{{< border.inline >}}
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{{- range (index $.Site.Data "theme-colors") }}
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<span class="border border-{{ .name }}"></span>
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<span class="border border-{{ .name }}-subtle"></span>
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{{- end -}}
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{{< /border.inline >}}
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<span class="border border-black"></span>
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<span class="border border-white"></span>
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{{< /example >}}
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Or modify the default `border-color` of a component:
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{{< example >}}
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<div class="mb-4">
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<label for="exampleFormControlInput1" class="form-label">Email address</label>
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<input type="email" class="form-control border-success" id="exampleFormControlInput1" placeholder="name@example.com">
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</div>
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<div class="h4 pb-2 mb-4 text-danger border-bottom border-danger">
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Dangerous heading
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</div>
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<div class="p-3 bg-info bg-opacity-10 border border-info border-start-0 rounded-end">
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Changing border color and width
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</div>
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{{< /example >}}
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## Opacity
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{{< added-in "5.2.0" >}}
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Bootstrap `border-{color}` utilities are generated with Sass using CSS variables. This allows for real-time color changes without compilation and dynamic alpha transparency changes.
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### How it works
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Consider our default `.border-success` utility.
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```css
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.border-success {
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--bs-border-opacity: 1;
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border-color: rgba(var(--bs-success-rgb), var(--bs-border-opacity)) !important;
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}
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```
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We use an RGB version of our `--bs-success` (with the value of `25, 135, 84`) CSS variable and attached a second CSS variable, `--bs-border-opacity`, for the alpha transparency (with a default value `1` thanks to a local CSS variable). That means anytime you use `.border-success` now, your computed `color` value is `rgba(25, 135, 84, 1)`. The local CSS variable inside each `.border-*` class avoids inheritance issues so nested instances of the utilities don't automatically have a modified alpha transparency.
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### Example
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To change that opacity, override `--bs-border-opacity` via custom styles or inline styles.
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{{< example >}}
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<div class="border border-success p-2 mb-2">This is default success border</div>
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<div class="border border-success p-2" style="--bs-border-opacity: .5;">This is 50% opacity success border</div>
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{{< /example >}}
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Or, choose from any of the `.border-opacity` utilities:
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{{< example >}}
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<div class="border border-success p-2 mb-2">This is default success border</div>
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<div class="border border-success p-2 mb-2 border-opacity-75">This is 75% opacity success border</div>
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<div class="border border-success p-2 mb-2 border-opacity-50">This is 50% opacity success border</div>
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<div class="border border-success p-2 mb-2 border-opacity-25">This is 25% opacity success border</div>
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<div class="border border-success p-2 border-opacity-10">This is 10% opacity success border</div>
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{{< /example >}}
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## Width
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{{< example class="bd-example-border-utils" >}}
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<span class="border border-1"></span>
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<span class="border border-2"></span>
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<span class="border border-3"></span>
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<span class="border border-4"></span>
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<span class="border border-5"></span>
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{{< /example >}}
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## Radius
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Add classes to an element to easily round its corners.
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{{< example class="bd-example-rounded-utils" >}}
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{{< placeholder width="75" height="75" class="rounded" title="Example rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-top" title="Example top rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-end" title="Example right rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-bottom" title="Example bottom rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-start" title="Example left rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-circle" title="Completely round image" >}}
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{{< placeholder width="150" height="75" class="rounded-pill" title="Rounded pill image" >}}
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{{< /example >}}
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### Sizes
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Use the scaling classes for larger or smaller rounded corners. Sizes range from `0` to `5`, and can be configured by modifying the utilities API.
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{{< example class="bd-example-rounded-utils" >}}
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{{< placeholder width="75" height="75" class="rounded-0" title="Example non-rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-1" title="Example small rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-2" title="Example default rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-3" title="Example large rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-4" title="Example larger rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-5" title="Example extra large rounded image" >}}
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{{< /example >}}
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{{< example class="bd-example-rounded-utils" >}}
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{{< placeholder width="75" height="75" class="rounded-bottom-1" title="Example small rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-start-2" title="Example default left rounded image" >}}
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{{< placeholder width="75" height="75" class="rounded-end-circle" title="Example right completely round image" >}}
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{{< placeholder width="75" height="75" class="rounded-start-pill" title="Example left rounded pill image" >}}
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{{< placeholder width="75" height="75" class="rounded-5 rounded-top-0" title="Example extra large bottom rounded image" >}}
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{{< /example >}}
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## CSS
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### Variables
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{{< added-in "5.2.0" >}}
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{{< scss-docs name="root-border-var" file="scss/_root.scss" >}}
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### Sass variables
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{{< scss-docs name="border-variables" file="scss/_variables.scss" >}}
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{{< scss-docs name="border-radius-variables" file="scss/_variables.scss" >}}
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Variables for setting `border-color` in `.border-*-subtle` utilities in light and dark mode:
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{{< scss-docs name="theme-border-subtle-variables" file="scss/_variables.scss" >}}
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{{< scss-docs name="theme-border-subtle-dark-variables" file="scss/_variables-dark.scss" >}}
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### Sass maps
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Color mode adaptive border colors are also available as a Sass map:
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{{< scss-docs name="theme-border-subtle-map" file="scss/_maps.scss" >}}
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{{< scss-docs name="theme-border-subtle-dark-map" file="scss/_maps.scss" >}}
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### Sass mixins
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{{< scss-docs name="border-radius-mixins" file="scss/mixins/_border-radius.scss" >}}
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### Sass utilities API
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Border utilities are declared in our utilities API in `scss/_utilities.scss`. [Learn how to use the utilities API.]({{< docsref "/utilities/api#using-the-api" >}})
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{{< scss-docs name="utils-borders" file="scss/_utilities.scss" >}}
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{{< scss-docs name="utils-border-radius" file="scss/_utilities.scss" >}}
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