a {
      position: absolute;
      top: 1rem;
      right: 1rem;
      font-size: 1.5rem;
      text-decoration: none;
      color: black;
      font-weight: bold;
      font-family: Helvetica, sans-serif;
      opacity: 0.6;
    }
    a:hover {
      opacity: 1.0;
    }