* { 
    filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1); 
    -webkit-filter: grayscale(100%); 
    -moz-filter: grayscale(100%); 
    -ms-filter: grayscale(100%); 
    -o-filter: grayscale(100%); 
    filter: grayscale(100%); 
    filter: gray; 
}