Bootstrap 5.3 extends beyond basic grids to support advanced UI patterns and interactions. It provides responsive layouts using Flexbox and native CSS Grid via custom utilities, theme-aware color modes (data-bs-theme="dark"), Sass mixins for custom themes, and enhanced offcanvas breakpoints for responsive sidebars. Modern components include underline navs (.nav-underline), hanging icon layouts, and subtle color variants (bg-primary-subtle) that adapt automatically. These utilities enable complex dashboards and interactive designs while keeping CSS minimal.
Example:-


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