.bg-section  {
  width: 100%;
  height: 400px;
  position: relative;
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}

.bg-section:before {
  content: "";
  left: 0;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  z-index: 1;
}

#bg-section-image-contenuto {
  position: relative;
  z-index: 1;
}