With the latest planned upgrade to the Bootstrap web development framework, builders are offering CSS variables for all components, along with new helpers and utilities.
Bootstrap v5.2.0-beta1, published May 13, is being called the biggest release of the framework since Bootstrap 5.0 two years ago. Components now include easier theming and CSS variables to enable real-time customization. Color-mode support, beginning with dark mode, will be added soon. Component pages have been updated to include a reference guide of relevant CSS variables. Values for most CSS variables are assigned via Sass variables; customization via CSS and Sass are both supported.