@function box-shadow($depth) {
  $primary-offset-1: nth(1 3 10 14 19, $depth) * 1px;
  $primary-offset-2: nth(1 3 6 10 15, $depth) * 1px;
  $blur-1: nth(3 6 20 28 38, $depth) * 1px;
  $blur-2: nth(2 6 6 10 12, $depth) * 1px;
  $color-1: rgba($black, nth(0.12 0.16 0.19 0.25 0.3, $depth));
  $color-2: rgba($black, nth(0.24 0.23 0.23 0.22 0.22, $depth));
  @return 0 $primary-offset-1 $blur-1 $color-1 , 0 $primary-offset-2 $blur-2 $color-2;
}