SASS Padding margin class loop

spacing.scss

// Adjust this to be the rem size you need
$spaceamounts: (
  8: 0.5,
  16: 1,
  24: 1.5,
  32: 2,
  40: 2.5,
  48: 3,
  56: 3.5,
  64: 4,
  72: 4.5,
  80: 5,
  88: 5.5,
  96: 6,
  104: 6.5,
  112: 7,
);
$sides: (all, top, bottom, left, right);

// Margin & padding
@each $key, $value in $spaceamounts {
  @each $side in $sides {
    .m-#{str-slice($side, 0, 1)}-#{$key} {
      margin-#{$side}: #{$value}rem;
    }

    .p-#{str-slice($side, 0, 1)}-#{$key} {
      padding-#{$side}: #{$value}rem;
    }
  }
}