html.gray {
  -webkit-filter: grayscale(100%);
  /* webkit */
  -moz-filter: grayscale(100%);
  /*firefox*/
  -ms-filter: grayscale(100%);
  /*ie9*/
  -o-filter: grayscale(100%);
  /*opera*/
  filter: grayscale(100%);
  filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
  -webkit-filter: gray;
          filter: gray;
  /*ie9- */
}
.ie-cover {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #000000;
  z-index: 999;
}
.ie-cover .p {
  width: 200px;
  position: absolute;
  top: 50%;
  left: 50%;
  color: #fff;
  font-size: 30px;
  margin-left: -150px;
}