Parallax

body{
  margin: 0;
  background-color: #1d1e22;
}
#parallax {
  position: relative;
  width: 100%;
  height: 100vh;
  background-image: url(https://raw.githubusercontent.com/oscicen/oscicen.github.io/master/img/depth-3.png), url(https://raw.githubusercontent.com/oscicen/oscicen.github.io/master/img/depth-2.png), url(https://raw.githubusercontent.com/oscicen/oscicen.github.io/master/img/depth-1.png);
  background-repeat: no-repeat;
  background-position: center;
  background-position: 50% 50%;
}
h1 {
  position: absolute;
  top: 47%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-family: "Arial";
  text-transform: uppercase;
  opacity: .2;
  font-size: 70px;
}