/* https://html-online.com/articles/dynamic-scroll-back-top-page-button-javascript/ */

#back2Top {
  width: 40px;
  line-height: 40px;
  overflow: hidden;
  z-index: 999;
  display: none;
  cursor: pointer;
  -moz-transform: rotate(270deg);
  -webkit-transform: rotate(270deg);
  -o-transform: rotate(270deg);
  -ms-transform: rotate(270deg);
  transform: rotate(270deg);
  position: fixed;
  bottom: 50px;
  right: 0;
  background-color:white;
  color: #555;
  text-align: center;
  font-size: 30px;
  text-decoration: none;
}
#back2Top:hover {
  background-color: #DDF;
  color: #000;
}