.cd-top {
  display: inline-block;
  height: 40px;
  width: 40px;
  position: fixed;
  bottom: 50px;
  right: 40px;
  overflow: hidden;
  text-indent: 100%;
  background: rgba(0,0,0,.2) url(../images/cd-top-arrow.svg) no-repeat center 50%;
  visibility: hidden;
  opacity: 0;
  -webkit-transition: all .3s ease;
  -moz-transition: all .3s ease;
  transition: all .3s ease;
  z-index: 1000;
}
.cd-top:hover {
  -webkit-transition: all .3s ease;
  -moz-transition: all .3s ease;
  transition: all .3s ease;
}
.cd-top.cd-is-visible {
  /* the button becomes visible */
  visibility: visible;
  opacity: 1;
}
.no-touch .cd-top:hover {
  background-color: rgba(0,0,0,.8);
  opacity: 1;
}