e471ea0617
* Variable overrides within the same Sass file can come before or after the default value, but across files they must come first. * Removed the double :: at the end of the paragraph. * Fixed usage of overwrite when we mean override.
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| layout | title | description | group | toc |
|---|---|---|---|---|
| docs | Customization options | Customize Bootstrap 4 with our new built-in Sass variables for global style preferences for easy theming and component changes. | getting-started | true |
Customizing variables
Every Sass variable in Bootstrap 4 includes the !default flag allowing you to override the variable's default value in your own Sass without modifying Bootstrap's source code. Copy and paste variables as needed, modify their values, and remove the !default flag. If a variable has already been assigned, then it won't be re-assigned by the default values in Bootstrap.
Variable overrides within the same Sass file can come before or after the default variables. However, when overriding across Sass files, your overrides must come before you import Bootstrap's Sass files.
Here's an example that changes the background-color and color for the <body> when importing and compiling Bootstrap via npm:
{% highlight scss %} // Your variable overrides $body-bg: #000; $body-color: #111;
// Bootstrap and its default variables @import "node_modules/bootstrap/scss/bootstrap"; {% endhighlight %}
Repeat as necessary for any variable in Bootstrap, including the global options below.
Global options
Customize Bootstrap 4 with our built-in custom variables file and easily toggle global CSS preferences with new $enable-* Sass variables. Override a variable's value and recompile with npm run test as needed.
You can find and customize these variables for key global options in our _variables.scss file.
| Variable | Values | Description |
|---|---|---|
$spacer |
1rem (default), or any value > 0 |
Specifies the default spacer value to programmatically generate our [spacer utilities]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/spacing/). |
$enable-rounded |
true (default) or false |
Enables predefined border-radius styles on various components. |
$enable-shadows |
true or false (default) |
Enables predefined box-shadow styles on various components. |
$enable-gradients |
true or false (default) |
Enables predefined gradients via background-image styles on various components. |
$enable-transitions |
true (default) or false |
Enables predefined transitions on various components. |
$enable-hover-media-query |
true or false (default) |
... |
$enable-grid-classes |
true (default) or false |
Enables the generation of CSS classes for the grid system (e.g., .container, .row, .col-md-1, etc.). |
$enable-print-styles |
true (default) or false |
Enables styles for optimizing printing. |
Color
Many of Bootstrap's various components and utilities are built through a series of colors defined in a Sass map. This map can be looped over in Sass to quickly generate a series of rulesets.
All colors
All colors available in Bootstrap 4, available as Sass variables and a Sass map in our scss/_variables.scss file. This will be expanded upon in subsequent minor releases to add additional shades, much like the grayscale palette we already include.
Here's how you can use these in your Sass:
{% highlight scss %} // With variable .alpha { color: $purple; }
// From the Sass map with our color() function
.beta { color: color("purple"); }
{% endhighlight %}
[Color utility classes]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/colors/) are also available for setting color and background-color.
{% callout info %} In the future, we'll aim to provide Sass maps and variables for shades of each color as we've done with the grayscale colors below. {% endcallout %}
Theme colors
We use a subset of all colors to create a smaller color palette for generating color schemes, also available as Sass variables and a Sass map in our scss/_variables.scss file.
Grays
An expansive set of gray variables and a Sass map in scss/_variables.scss for consistent shades of gray across your project.
Within _variables.scss, you'll find our color variables and Sass map. Here's an example of the $colors Sass map:
{% highlight scss %} $colors: ( red: $red, orange: $orange, yellow: $yellow, green: $green, teal: $teal, blue: $blue, pink: $pink, purple: $purple, white: $white, gray: $gray-600, gray-dark: $gray-900 ) !default; {% endhighlight %}
Add, remove, or modify values within the map to update how they're used in many other components. Unfortunately at this time, not every component utilizes this Sass map. Future updates will strive to improve upon this. Until then, plan on making use of the ${color} variables and this Sass map.