Example
Provide an option to dismiss or close a component with .btn-close. Default styling is limited, but highly customizable. Modify the Sass variables to replace the default background-image. Be sure to include text for screen readers, as we’ve done with aria-label.
<button type="button" class="btn-close" aria-label="Close"></button>Disabled state
Disabled close buttons change their opacity. We’ve also applied pointer-events: none and user-select: none to preventing hover and active states from triggering.
<button type="button" class="btn-close" disabled aria-label="Close"></button>Dark variant
Add data-bs-theme="dark" to the .btn-close, or to its parent element, to invert the close button. This uses the filter property to invert the background-image without overriding its value.
<div data-bs-theme="dark">
<button type="button" class="btn-close" aria-label="Close"></button>
<button type="button" class="btn-close" disabled aria-label="Close"></button>
</div>CSS
Variables
As part of Bootstrap’s evolving CSS variables approach, close button now uses local CSS variables on .btn-close for enhanced real-time customization. Values for the CSS variables are set via Sass, so Sass customization is still supported, too.
--#{$prefix}btn-close-color: #{$btn-close-color};
--#{$prefix}btn-close-bg: #{ escape-svg($btn-close-bg) };
--#{$prefix}btn-close-opacity: #{$btn-close-opacity};
--#{$prefix}btn-close-hover-opacity: #{$btn-close-hover-opacity};
--#{$prefix}btn-close-focus-shadow: #{$btn-close-focus-shadow};
--#{$prefix}btn-close-focus-opacity: #{$btn-close-focus-opacity};
--#{$prefix}btn-close-disabled-opacity: #{$btn-close-disabled-opacity};
--#{$prefix}btn-close-white-filter: #{$btn-close-white-filter};Sass variables
$btn-close-width: 24px; // Modus customized
$btn-close-height: $btn-close-width;
$btn-close-padding-x: .25em;
$btn-close-padding-y: $btn-close-padding-x;
$btn-close-color: $black;
$btn-close-bg: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='#{$btn-close-color}'><path d='M18.3 5.71a.996.996 0 0 0-1.41 0L12 10.59 7.11 5.7A.996.996 0 1 0 5.7 7.11L10.59 12 5.7 16.89a.996.996 0 1 0 1.41 1.41L12 13.41l4.89 4.89a.996.996 0 1 0 1.41-1.41L13.41 12l4.89-4.89c.38-.38.38-1.02 0-1.4Z'/></svg>");
$btn-close-focus-shadow: $focus-ring-box-shadow;
$btn-close-opacity: 1; // Modus customized
$btn-close-hover-opacity: .75;
$btn-close-focus-opacity: 1;
$btn-close-disabled-opacity: .25;
$btn-close-white-filter: invert(1) grayscale(100%) brightness(200%);