bootstrap/scss/_variables-dark.scss

// Dark color mode variables
//
// Custom variables for the `[data-theme="dark"]` theme. Use this as a starting point for your own custom color modes by creating a new theme-specific file like `_variables-dark.scss` and adding the variables you need.

$body-color-dark:                   $gray-500 !default;
$body-bg-dark:                      $gray-900 !default;
$body-secondary-color-dark:         rgba($body-color-dark, .75) !default;
$body-secondary-bg-dark:            $gray-800 !default;
$body-tertiary-color-dark:          rgba($body-color-dark, .5) !default;
$body-tertiary-bg-dark:             mix($gray-800, $gray-900, 50%) !default;
$emphasis-color-dark:               $white !default;
$accent-bg-dark:                    $blue-300 !default;
$accent-color-dark:                 color-contrast($accent-bg-dark) !default;
$accent-border-dark:                $blue-400 !default;
$border-color-dark:                 $gray-700 !default;
$headings-color-dark:             #fff !default;
$link-color-dark:                   $blue-300 !default;
$link-hover-color-dark:             $blue-200 !default;
$code-color-dark:                   $pink-300 !default;

$form-select-indicator-color-dark:  $body-color-dark !default;
$form-select-indicator-dark:        url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path fill='none' stroke='#{$form-select-indicator-color-dark}' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/></svg>") !default;

$form-switch-color-dark:            rgba($white, .25) !default;
$form-switch-bg-image-dark:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-color-dark}'/></svg>") !default;