#page-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  font-size: 77%;
}
#page-top a {
  width: 100px;
  display: block;
  margin-bottom: 5px;
}
@media screen and (max-width:608px) {
  #page-top {
    bottom: 0;
  }
  #page-top a {
    width: 50px;
    margin: 0;
  }
}