The framework comes with a few different themes included.
Each theme is available as a separate stylesheet. To change theme you will need to replace black below with your desired theme name in index.html:
<link rel="stylesheet" href="dist/theme/black.css">
All theme variables are exposed as CSS custom properties in the pseudo-class
:root. See the list of exposed variables.
Creating a Theme
If you want to add a theme of your own see the instructions here: /css/theme/README.md.
Alternatively, if you want a clean start, you can opt to start from a blank CSS document and customize everything from the ground up.