.anchor {
      float: left;
      padding-right: 4px;
      margin-left: -20px;
    }
    h1 .anchor svg,
    h2 .anchor svg,
    h3 .anchor svg,
    h4 .anchor svg,
    h5 .anchor svg,
    h6 .anchor svg {
      visibility: hidden;
    }
    h1:hover .anchor svg,
    h2:hover .anchor svg,
    h3:hover .anchor svg,
    h4:hover .anchor svg,
    h5:hover .anchor svg,
    h6:hover .anchor svg,
    h1 .anchor:focus svg,
    h2 .anchor:focus svg,
    h3 .anchor:focus svg,
    h4 .anchor:focus svg,
    h5 .anchor:focus svg,
    h6 .anchor:focus svg {
      visibility: visible;
    }