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BS Base
The bs_base project is a base theme aimed at supporting the complete Drupal theme development workflow from start to finish. It provides a subtheme-ready foundation using the Bootstrap 4.x framework. Additionally, this base theme offers a variety of tools for front-end developers to make their lives easier: Drush generator, SASS inheritance, powerful Gulp workflow, and more.
Note that this is a base theme and is intended to be used by external developers to build new subthemes from it. You can use it out of the box as a main theme, but that is not its intended purpose.