.cd-top {
  display: inline-block;
  height: 102px;
  width: 97px;
  position: fixed;
  bottom: 40px;
  right: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
  
  overflow: hidden;
  text-indent: 100%;
  white-space: nowrap;
  background: url(../image/top21.png) no-repeat center;
  visibility: hidden;
  opacity: 0;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}
.cd-top.cd-is-visible {
  
  visibility: visible;
  opacity: 1;
}
.cd-top.cd-fade-out {
  
  opacity: .5;
}
.no-touch .cd-top:hover {
  background-color: #e86256;
  opacity: 1;
}