@media screen {
  a {
    color: black;
    height: 8px; } }
a {
  color: red; }
  @media screen {
    a {
      color: blue;
      height: 10px; } }

a {
  color: beige; }
  a b {
    color: teal; }
    @media screen {
      a b {
        color: orange; }
        a b c {
          height: 12px; } }