/*---------------------
 back top
 ---------------------*/
  .footer_backtop{
    position:fixed;
    bottom:70px;
    right: 20px;
    overflow:hidden;
    text-indent:100%;
    white-space:nowrap;
    width:40px;
    height:40px;
    display: none;
    z-index:10;
  }
  .footer_backtop a{
    position:relative;
    display:block;
    width:40px;
    height:40px;
    border: #c1b6bade solid 1px;
    border-radius:50%;
    background: #a4999cb0;
    box-sizing:border-box;
  }
  .footer_backtop a:hover{
    opacity:.7;
  }
  .footer_backtop a::before{
    content:"";
    position:absolute;
    display:inline-block;
    border-left: #ffffff solid 1px;
    border-top: #ffffff solid 1px;
    width:10px;
    height:10px;
    transform:rotate(45deg);
    left: 0;
    top: 14px;
    right:0;
    margin:auto;
  }
  .footer_backtop a::after{
    content:"";
    position:absolute;
    display:inline-block;
    width:1px;
    height:15px;
    background: #fff;
    left: 0;
    top: 14px;
    right:0;
    margin:auto;
    border-radius:10px;
  }