/* back to top -------------------------*/
#back-top {
  position: fixed;
  bottom: 70px;
  left: 51%;
  z-index: 1000;
  display: none;
  margin-left: 440px;
  width: 32px;
  height: 32px;
  background: #000000;
  color: #fff;
  border-radius: 500px;
  text-align: center;
  cursor: pointer;

}
#back-top i{line-height: 32px; font-size: 22px;}
#back-top:hover {
	color: #d13b22;
  background: #000000;
}