html.specialgrey{
    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);
}