.ud-hero {
  position: relative; 
  z-index: 1; 
}

.ud-hero::before {
  content: '';
  position: absolute; 
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.3);
  z-index: -1; 
}