1 <style>
 2 html{
 3 -webkit-filter: grayscale(100%);
 4 -moz-filter: grayscale(100%);
 5 -ms-filter: grayscale(100%);
 6 -o-filter: grayscale(100%);
 7 filter: grayscale(100%);
 8 filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
 9 filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
10 }
11 </style>