.scroll {
  display: none;
  position: fixed;
  bottom: 30px;
  right: 30px;
}
.scroll a {
  display: block;
  width: 36px;
  height: 36px;
  background-color: #333;
  text-align: center;
  color: #fff;
  font-size: 16px;
  text-decoration: none;
  line-height: 36px;
}