message: refactor(aio): simplify `.header-link` styles
  PR Close
diff: display: none;
  }
  - .mat-icon, .material-icons {
  - visibility: hidden;
  - display: inline-block;
  + .header-link {
  color: $mediumgray;
  - margin: 0 8px;
  + display: inline-block;
  + margin-left: -42px;
  + padding: 0 8px;
  + text-decoration: none;
  + vertical-align: middle;
  + visibility: hidden;
  }
  - &:hover {
  - .mat-icon, .material-icons {
  + &:hover .header-link {
  visibility: visible;
  }
  }
  - a.header-link {
  - text-decoration: none;
  - padding-left: 8px;
  - margin-left: -50px;
  - display: inline-block;
  - vertical-align: middle;
  - }
  - }
  -
  .l-sub-section {
  h1, h2, h3, h4, h5, h6 {
  a {
  