.photo-gallery {
  padding: 150px 0;
}

.overlay_parallax {
  background: rgba(10,179,150,0.26);
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  z-index: 0;
}

img:hover {
  opacity: 0.8!important;
}

.btn:hover {
  opacity: 0.8;
}