/*by yzx 20200404*/
/*特殊日子IE10及其以上浏览器 全站灰色*/
/*html, html *{
    filter: gray !important;
    filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
    filter: grayscale(100%);
    -webkit-filter: grayscale(100%);
    -moz-filter: grayscale(100%);
    -ms-filter: grayscale(100%);
    -o-filter: grayscale(100%); 
}*/