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| layout | title | description | group | toc |
|---|---|---|---|---|
| docs | Customization options | Customize Bootstrap 4 with our built-in custom variables file and easily toggle global CSS preferences with new Sass variables. | getting-started | true |
Customizing variables
Bootstrap 4 ships with a _custom.scss file for easy overriding of default variables in /scss/_variables.scss. Copy and paste relevant lines from there into the _custom.scss file, modify the values, and recompile your Sass to change our default values. Be sure to remove the !default flag from override values.
For example, to change out the background-color and color for the <body>, you'd do the following:
{% highlight scss %}
// Bootstrap overrides
//
// Copy variables from _variables.scss to this file to override default values
// without modifying source files.
$body-bg: $gray-dark; $body-color: $gray-light; {% endhighlight %}
Do the same for any variable you need to override, including the global options listed 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. |
$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.
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-light, gray-dark: $gray-dark ) !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.