Bootstrap/site/assets/scss/_variables.scss

// Local docs variables
$bd-purple:        #4c0bce;
$bd-violet:        lighten(saturate($bd-purple, 5%), 15%); // stylelint-disable-line function-disallowed-list
$bd-purple-light:  lighten(saturate($bd-purple, 5%), 45%); // stylelint-disable-line function-disallowed-list
$bd-accent:        #ffe484;

$bd-gutter-x: 3rem;
$bd-callout-variants: info, warning, danger !default;

:root,
[data-bs-theme="light"] {
  --bd-purple: #{$bd-purple};
  --bd-violet: #{$bd-violet};
  --bd-accent: #{$bd-accent};
  --bd-violet-rgb: #{to-rgb($bd-violet)};
  --bd-accent-rgb: #{to-rgb($bd-accent)};
  --bd-pink-rgb: #{to-rgb($pink-500)};
  --bd-teal-rgb: #{to-rgb($teal-500)};
  --bd-violet-bg: var(--bd-violet);
  --bd-toc-color: var(--bd-violet);
  --bd-sidebar-link-bg: rgba(var(--bd-violet-rgb), .1);
  --bd-callout-link: #{to-rgb($blue-600)};
  --bd-callout-code-color: #{$pink-600};
  --bd-pre-bg: var(--bs-tertiary-bg);
}

@include color-mode(dark, true) {
  --bd-violet: #{mix($bd-violet, $white, 75%)};
  --bd-violet-bg: #{$bd-violet};
  --bd-toc-color: var(--#{$prefix}emphasis-color);
  --bd-sidebar-link-bg: rgba(#{to-rgb(mix($bd-violet, $black, 75%))}, .5);
  --bd-callout-link: #{to-rgb($blue-300)};
  --bd-callout-code-color: #{$pink-300};
  --bd-pre-bg: #{adjust-color($gray-900, $lightness: -2.5%)}; // stylelint-disable-line scss/at-function-named-arguments
}