body.zaloba {
  filter: grayscale(100%);
  -webkit-filter: grayscale(100%);
}
body.zaloba::before {
  content: "";
  position: fixed;
  top: 24px;
  left: -60px;
  width: 200px;
  height: 28px;
  background: #000;
  transform: rotate(-45deg);
  z-index: 2147483647;
  pointer-events: none;
  box-shadow: 0 2px 6px rgba(0,0,0,.4);
}