.backHeader {
  position: fixed;
  top: 0;
  height: 6rem;
  width: 6.5rem;
  line-height: 6rem;
  z-index: 999;
  text-align: center;
  background-color: #FFFFFF;
  color: #81848A;
  border-top: 1px solid #F3F4F4;
  border-right: 1px solid #F3F4F4;
  border-left: 1px solid #F3F4F4;
  cursor: pointer;
  &:before {
    content: '\F053';
    font-family: 'FontAwesome';
    font-size: 1.8rem;
    font-weight: bolder;
  }
  &:hover {
    background-color: #F3F4F4;
  }
}