bootstrap/scss/mixins/_focus-ring.scss

@use "../config" as *;

@mixin focus-ring($offset: false, $color: null) {
  @if $color != null {
    outline: var(--#{$prefix}focus-ring-width) solid #{$color};
  } @else {
    outline: var(--#{$prefix}focus-ring);
  }
  @if $offset {
    outline-offset: var(--#{$prefix}focus-ring-offset);
  }
}