header.masthead {
  background: url("../../assets/img/HeroBackground-xxlarge.jpg");
  background-size: cover;
}

header.masthead:before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.5);
}