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---
layout: page
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title: Customize CSS
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group: getting-started
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---
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New to Bootstrap 4, variable-based customization is a way for folks to quickly enable or disable global styles across all of Bootstrap's CSS. Simply update a variable's value and recompile using our Gruntfile.
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## Available variables
You can find and customize these variables 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-flex` | `true` or `false` (default) | Swaps `float` and `display: table` styles for `display: flex` . |
| `$enable-rounded` | `true` (default) or `false` | Enables predefined `border-radius` styles on various components. |
| `$enable-shadows` | `true` or `false` (default) | Enables predefined `box-shadow` styles on various components. |
| `$enable-gradients` | `true` or `false` (default) | Enables predefined gradients via `background-image` various components. |
| `$enable-transitions` | `true` (default) or `false` | Enables predefined `transition` s on various components. |
| `$enable-hover-media-query` | `true` or `false` (default) | ... |
