message: adjust the spacing around the header for mobile.
diff: @@ -39,6 +39,14 @@ main > header:first-child,
  }
  main > header:first-child {
  max-width: 900px;
  +
  + @media (max-width: 1040px) {
  + padding: 0 var(--small);
  + }
  +
  + @media (max-width: 600px) {
  + padding: 0 var(--xx-small);
  + }
  }
  .brief h2 {
  margin-bottom: 2rem;
  