@layer props {
  :root {
    @each $key, $val in (xxs, xs, s, m, l, xl, xxl, xxxl),
      (0.0625rem, 0.25rem, 0.5rem, 1rem, 2rem, 2.5rem, 3rem, 4rem)
    {
      --size__$(key): $(val);
    }
  }
}