message: adjust the header max-width for small devices.
diff: @@ -38,6 +38,12 @@ main > header:first-child,
  }
  main > header:first-child {
  max-width: 900px;
  + margin-left: auto;
  + margin-right: auto;
  +
  + @media (max-width: 1140px) {
  + max-width: 600px;
  + }
  @media (max-width: 1040px) {
  padding: 0 var(--small);
  