#homeBox {
  /* 置灰处理开始 */
  /* filter: grayscale(100%);
  -webkit-filter: grayscale(100%);
  -moz-filter: grayscale(100%);
  -ms-filter: grayscale(100%);
  -o-filter: grayscale(100%);
  filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
  -webkit-filter: grayscale(1); */
  /*  置灰处理结束 */
}