/*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,<svg xmlns='http://www.w3.org/2000/svg'><filter id=… 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0'/></filter></svg>#grayscale);
      -webkit-filter: grey;
      filter: gray;
}*/