.bg {
  background: url('/assets/banner.jpg') no-repeat 0% 30%;
  background-size: cover;
  position: fixed;
  width: 100%;
  height: 350px; /*same height as jumbotron */
  top:0;
  left:0;
  z-index: -1;
}

.jumbotron {
  height: 210px;
  color: white;
  text-shadow: #444 0 10px 10px;
  background:transparent;
}