@charset "utf-8";
.cd-top {
  display: inline-block;
  height: 54px;
  width: 54px;
  position: absolute;
  top: 0;
  right: 0;
  /* image replacement properties */
  overflow: hidden;
  text-indent: 100%;
  white-space: nowrap;
  background: url(../img/main/top.jpg) no-repeat;
  visibility: visible;
  opacity: 1;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}
.cd-top.cd-is-visible {
  /* the button becomes visible */
  visibility: visible;
  opacity: 1;
}
.cd-top.cd-fade-out {
  /* 如果用户继续向下滚动,这个按钮的透明度会变得更低 */
  opacity: 1;
}
.no-touch .cd-top:hover {
  opacity: 1;
}