h1::before,
h2::before,
h3::before,
h4::before,
h5::before,
h6::before {
  display: block;
  content: ' ';
  margin-top: -70px;
  height: 70px;
  visibility: hidden;
  pointer-events: none;
  position: relative;
}

h1:hover .icon-link,
h2:hover .icon-link,
h3:hover .icon-link,
h4:hover .icon-link,
h5:hover .icon-link,
h6:hover .icon-link,
.icon.icon-link:hover {
  visibility: visible;
}
.icon.icon-link {
  background-image: url(./link.svg);
  background-repeat: no-repeat;
  width: 16px;
  height: 16px;
  display: block;
  position: absolute;
  visibility: hidden;
  margin-left: -20px;
  width: 20px;
  margin-top: 8px;
}