Bootstrap 5.3.0 emphasizes dark mode, custom colors

Bootstrap 5.3.0, the latest version of the CSS, JavaScript, and HTML web framework, has arrived with an emphasis on dark mode and custom color modes.

The final stable release of this update to the mobile-first application framework was announced May 30 and can be accessed from In this version, Bootstrap’s core was rewritten to offer “first class” support for dark mode, which is opt-in by default. Bootstrap also now supports any number of color modes for building custom themes or more-nuanced color modes. Dark mode styles are generated via a new color-mode() Sass mixin, allowing developers to write styles specific to a particular color mode. A new _variables-dark.scss stylesheet, meanwhile, houses dark-mode-specific Sass variables. Also in Bootstrap 5.3.0:

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