html {-webkit-filter: grayscale(100%); -moz-filter: grayscale(100%); -ms-filter: grayscale(100%); -o-filter: grayscale(100%); filter: grayscale(100%); filter: url("data:image/svg+xml;utf8, #grayscale"); filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);}