Here’s an example that changes the background-color and color for the when importing and compiling Bootstrap via npm: // Your variable overrides $body-bg : #000 $body-color : #111 // Bootstrap and its default variables "./node_modules/bootstrap/scss/bootstrap" However, when overriding across Sass files, your overrides must come before you import Bootstrap’s Sass files. Variable overrides within the same Sass file can come before or after the default variables. You will find the complete list of Bootstrap’s variables in scss/_variables.scss. If a variable has already been assigned, then it won’t be re-assigned by the default values in Bootstrap. Copy and paste variables as needed, modify their values, and remove the !default flag. Variable defaultsĮvery 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. We suggest using the full import stack from our bootstrap.scss file as your starting point. You can also start to add parts of Bootstrap under the // Optional section as needed. With that setup in place, you can begin to modify any of the Sass variables and maps in your custom.scss. Custom.scss // Option A: Include all of Bootstrap "./node_modules/bootstrap/scss/bootstrap" // Custom.scss // Option B: Include parts of Bootstrap // Required "./node_modules/bootstrap/scss/functions" "./node_modules/bootstrap/scss/variables" "./node_modules/bootstrap/scss/mixins" // Optional "./node_modules/bootstrap/scss/reboot" "./node_modules/bootstrap/scss/type" "./node_modules/bootstrap/scss/images" "./node_modules/bootstrap/scss/code" "./node_modules/bootstrap/scss/grid" You also will need to include some JavaScript for our plugins. We encourage the latter, though be aware there are some requirements and dependencies across our components. You have two options: include all of Bootstrap, or pick the parts you need. In your custom.scss, you’ll import Bootstrap’s source Sass files. If you’ve downloaded our source files and aren’t using a package manager, you’ll want to manually setup something similar to that structure, keeping Bootstrap’s source files separate from your own. Assuming you’re using a package manager like npm, you’ll have a file structure that looks like this: your-project/ For Sass, that means creating your own stylesheet that imports Bootstrap so you can modify and extend it. Whenever possible, avoid modifying Bootstrap’s core files. Utilize our source Sass files to take advantage of variables, maps, mixins, and more. There’s no more dedicated theme stylesheet instead, you can enable the built-in theme to add gradients, shadows, and more. Now, theming is accomplished by Sass variables, Sass maps, and custom CSS. Bootstrap 4 provides a familiar, but slightly different approach. With some effort, one could completely redesign the look of Bootstrap 3 without touching the core files. In Bootstrap 3, theming was largely driven by variable overrides in LESS, custom CSS, and a separate theme stylesheet that we included in our dist files. Customize Bootstrap 4 with our new built-in Sass variables for global style preferences for easy theming and component changes.
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