message: Prefer hex codes over RGBA for tab headers
diff: flex-grow: 1;
  display: flex;
  text-align: center;
  - border: 1px solid rgba(255, 255, 255, 0.2);
  + border: 1px solid #FFFFFF20;
  font-size: 0.852em;
  border-top: 0;
  align-items: center;
  .tab-header[data-focused=true] {
  opacity: 1;
  - background-color: rgba(255, 255, 255, 0.1);
  + background-color: #FFFFFF10;
  }
  .tab-header:hover {
  