.greymap {
  height:100%;
    filter: url("data:image/svg+xml;utf8,#grayscale"); /* Firefox 10+ */
    filter: gray; /* IE6-9 */
	  -webkit-filter: grayscale(99%); /* Chrome 19+ & Safari 6+ */
	  -webkit-backface-visibility: hidden;  /* Fix for transition flickering */
  }