@font-face {
  font-family: 'docs';
  /* project id 100924 */
  src: url('//at.alicdn.com/t/font_tr9f90hxmm4sfw29.eot');
  src: url('//at.alicdn.com/t/font_tr9f90hxmm4sfw29.eot?#iefix') format('embedded-opentype'), url('//at.alicdn.com/t/font_tr9f90hxmm4sfw29.woff') format('woff'), url('//at.alicdn.com/t/font_tr9f90hxmm4sfw29.ttf') format('truetype'), url('//at.alicdn.com/t/font_tr9f90hxmm4sfw29.svg#iconfont') format('svg');
}
.back-top {
  width:50px;
  height: 50px;
  border-radius: 50px;
  text-align: center;
  line-height: 50px;
  border: 1px solid #DCDCDC;
  position: fixed;
  bottom: 68px;
  right: 15px !important;
  bottom: 70px !important;
  background-color: #E5E5E5;
  z-index: 999;
  display: none;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
}
.back-top:after {
  content: '\e606';
  font-family: 'docs';
  font-size: 26px;
  color: #EF4F4F;
}