bootstrap/scss/_spinners.scss

@use "config" as *;
@use "variables" as *;

// scss-docs-start spinner-variables
$spinner-width:           2rem !default;
$spinner-height:          $spinner-width !default;
$spinner-vertical-align:  -.125em !default;
$spinner-border-width:    .25em !default;
$spinner-animation-speed: .75s !default;

$spinner-width-sm:        1rem !default;
$spinner-height-sm:       $spinner-width-sm !default;
$spinner-border-width-sm: .2em !default;
// scss-docs-end spinner-variables

@layer components {
  //
  // Rotating border
  //

  .spinner-grow,
  .spinner-border {
    display: inline-block;
    width: var(--#{$prefix}spinner-width);
    height: var(--#{$prefix}spinner-height);
    vertical-align: var(--#{$prefix}spinner-vertical-align);
    // stylelint-disable-next-line property-disallowed-list
    border-radius: 50%;
    animation: var(--#{$prefix}spinner-animation-speed) linear infinite var(--#{$prefix}spinner-animation-name);
  }

  // scss-docs-start spinner-border-keyframes
  @keyframes spinner-border {
    to { transform: rotate(360deg) #{"/* rtl:ignore */"}; }
  }
  // scss-docs-end spinner-border-keyframes

  .spinner-border {
    // scss-docs-start spinner-border-css-vars
    --#{$prefix}spinner-width: #{$spinner-width};
    --#{$prefix}spinner-height: #{$spinner-height};
    --#{$prefix}spinner-vertical-align: #{$spinner-vertical-align};
    --#{$prefix}spinner-border-width: #{$spinner-border-width};
    --#{$prefix}spinner-animation-speed: #{$spinner-animation-speed};
    --#{$prefix}spinner-animation-name: spinner-border;
    // scss-docs-end spinner-border-css-vars

    border: var(--#{$prefix}spinner-border-width) solid currentcolor;
    border-right-color: transparent;
  }

  .spinner-border-sm {
    // scss-docs-start spinner-border-sm-css-vars
    --#{$prefix}spinner-width: #{$spinner-width-sm};
    --#{$prefix}spinner-height: #{$spinner-height-sm};
    --#{$prefix}spinner-border-width: #{$spinner-border-width-sm};
    // scss-docs-end spinner-border-sm-css-vars
  }

  //
  // Growing circle
  //

  // scss-docs-start spinner-grow-keyframes
  @keyframes spinner-grow {
    0% {
      transform: scale(0);
    }
    50% {
      opacity: 1;
      transform: none;
    }
  }
  // scss-docs-end spinner-grow-keyframes

  .spinner-grow {
    // scss-docs-start spinner-grow-css-vars
    --#{$prefix}spinner-width: #{$spinner-width};
    --#{$prefix}spinner-height: #{$spinner-height};
    --#{$prefix}spinner-vertical-align: #{$spinner-vertical-align};
    --#{$prefix}spinner-animation-speed: #{$spinner-animation-speed};
    --#{$prefix}spinner-animation-name: spinner-grow;
    // scss-docs-end spinner-grow-css-vars

    background-color: currentcolor;
    opacity: 0;
  }

  .spinner-grow-sm {
    --#{$prefix}spinner-width: #{$spinner-width-sm};
    --#{$prefix}spinner-height: #{$spinner-height-sm};
  }

  @if $enable-reduced-motion {
    @media (prefers-reduced-motion: reduce) {
      .spinner-border,
      .spinner-grow {
        --#{$prefix}spinner-animation-speed: #{$spinner-animation-speed * 2};
      }
    }
  }
}