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 the included Gruntfile as needed.
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:
// 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;
Do the same for any variable you need to override, including the global options listed below.
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 for 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. |
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