.scroll-top{
  cursor: pointer;
  position: fixed;
  line-height: 40px;
  bottom: 50px;
  right: 50px;
  color: #fff;
  background-color: rgba(0,0,0,.6);
  padding: 0 8px;
  /*display: none;*/
  -webkit-transition: background-color .2s ease;
  -o-transition: background-color .2s ease;
  transition: background-color .2s ease;
  border-radius: 4px;
}
.scroll-top:hover {
  background-color: rgba(0,0,0,.8);
}
.scroll-top .icon{
  vertical-align: middle;
}