.literal {
    height: 3em;
}

.literal-property {
    width: 3px;
}

.box-shadow {
  box-shadow: 1em 1em black, 1em 1em black;
}

.background {
  background: 1em solid white;
}

.function {
  color: test(2em);
}

//  using literals as property names
$sizes: (
  small: 2em,
  big : (
    important: 2rem
  )
);

.literal-property {
    width: 3px;
    height: 0;

    .red {
      width: 4;
      height: 5px;
    }
}