#vessel {
  background: #dfa7a7 url('http://lab3d.io/experiments/parallax/vessel.png');
  margin: 1.5em auto;
  overflow: hidden;
  position: relative;
  
  height: 450px;
  width: 100%;
  max-width: 800px;
}
#vessel img {
  position: absolute;
  overflow: hidden;
  top: 30px;
}