html * {
  background: #fff !important;
  background-color: #fff !important;
  color: black !important;
}

img {
  -webkit-filter: grayscale(100%) !important;
  -moz-filter: grayscale(100%) !important;
  -ms-filter: grayscale(100%) !important;
  -o-filter: grayscale(100%) !important;
  filter: grayscale(100%) !important;
  filter: gray !important; /* IE 6-9 */
}