#g-776106190::before {
  content: " ";
  background: rgba(0,0,0,0.5);
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
} 
#g-776106190 > div {
  z-index: 2;
}