.backdrop {
  // scss-docs-start modal-backdrop-css-vars
  --#{$prefix}backdrop-zindex: #{$zindex-modal};
  --#{$prefix}backdrop-bg: #{$modal-backdrop-bg};
  --#{$prefix}backdrop-opacity: #{$modal-backdrop-opacity};
  // scss-docs-end modal-backdrop-css-vars

  @include overlay-backdrop(var(--#{$prefix}backdrop-zindex), var(--#{$prefix}backdrop-bg), var(--#{$prefix}backdrop-opacity));
}