body::after {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  content: "";
  background-image: url("https://static1.squarespace.com/static/56f6b35201dbae402c1935b4/t/56f8735bb2d7c7b358d50294/1459123038148/bg_contact.jpg?format=1500w");
  background-repeat: no-repeat;
  opacity: 0.2;
  background-position: center;
  z-index: -1;
}