Creating a new theme from a base theme (subtheming)
Drupal supports a concept of subtheming, where you can declare your theme a subtheme, and it will inherit everything from the parent theme. This is useful when you want to implement a framework such as Bootstrap or U.S. Web Design System (USWDS).
Popular base themes
The community offers several base themes that can be found on Drupal.org
:
- Bootstrap barrio (https://www.drupal.org/project/bootstrap_barrio)
- Radix (https://www.drupal.org/project/radix)
- USWDS base (https://www.drupal.org/project/uswds)