Scrollbar SASS mixin

scrollbar.scss

@mixin scrollbars(
  $size: 10px,
  $foreground-color: white,
  $background-color: black
) {
  // For Chrome & Safari
  &::-webkit-scrollbar {
    width: $size;
    height: $size;
  }

  &::-webkit-scrollbar-thumb {
    background: $foreground-color;
    border-radius: $size;
  }

  &::-webkit-scrollbar-track {
    background: $background-color;
    border-radius: $size;
  }

  // Standard version (Firefox only for now)
  scrollbar-color: $foreground-color $background-color;
}