.hm-links {
  background-color: white;
  font-family: sans-serif;
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
}
.hm-links.hidden {
  visibility: hidden;
}
.hm-links > a,
.hm-links > ul li {
  display: block;
  text-align: center;
  margin: 0;
  padding: 0;
}
.hm-links > ul {
  margin: 0;
  padding: 0;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  display: block;
}
.hm-links > a:visited,
.hm-links > a:hover,
.hm-links.active {
  color: black;
  visibility: visible;
}
.hm-links > a:hover {
  background-color: gray;
}