.jr-back-to-top {
  width: 32px;
  height: 32px;
  position: fixed;
  right: 10px;
  bottom: 80px;
  z-index: 10;
  cursor: pointer;
  background-color: #000000;
  border-radius: 4px;
  opacity: 0.3;

  &:hover {
    background-color: #000000;
    border-radius: 4px;
    opacity: 0.5;
  }
  > i {
    &.icon-top-all {
      font-size: 32px;
      color: #fff;
    }
  }
}