CSS将网站颜色改成黑白色

html { 
    -webkit-filter: grayscale(100%); 
    -moz-filter: grayscale(100%); 
    -ms-filter: grayscale(100%); 
    -o-filter: grayscale(100%); 
    filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);  
    _filter:none; 
}