# Options

Quickly customize Bootstrap with built-in variables to easily toggle global CSS preferences for controlling style and behavior.

Customize Bootstrap 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 Bootstrap’s `scss/_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.
`$enable-transitions` | `true` (default) or `false` | Enables predefined `transition`s on various components.
`$enable-reduced-motion` | `true` (default) or `false` | Enables the `prefers-reduced-motion` media query, which suppresses certain animations/transitions based on the users’ browser/operating system preferences.
`$enable-grid-classes` | `true` (default) or `false` | Enables the generation of CSS classes for the grid system (e.g. `.row`, `.col-md-1`, etc.).
`$enable-caret` | `true` (default) or `false` | Enables pseudo element caret on `.dropdown-toggle`.
`$enable-button-pointers` | `true` (default) or `false` | Add “hand” cursor to non-disabled button elements.
`$enable-rfs` | `true` (default) or `false` | Globally enables RFS.
`$enable-validation-icons` | `true` (default) or `false` | Enables `background-image` icons within textual inputs and some custom forms for validation states.
`$enable-negative-margins` | `true` or `false` (default) | Enables the generation of negative margin utilities.
`$enable-deprecation-messages` | `true` or `false` (default) | Set to `true` to show warnings when using any of the deprecated mixins and functions that are planned to be removed in `v5`.
`$enable-important-utilities` | `true` (default) or `false` | Enables the `!important` suffix in utility classes.