.go-top {
  position: fixed;
  bottom: 2em;
  right: 2em;
  text-decoration: none;
  color: #fff;
  background-color: rgba(0, 0, 0, 0.3);
  font-size: 12px;
  padding: 1em;
  display: none;
}
.go-top:hover {
  background-color: rgba(0, 0, 0, 0.6);
}