1
 2
 3
 4
 5
 6
 7
 8
 9
10

<style>
    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;
    }
</style>