section.bg-img-responsive {
  background-image: url("http://media.istockphoto.com/photos/mature-man-walking-dog-in-frosty-landscape-picture-id473423242?s=2048x2048");
  background-repeat: no-repeat;
  position: relative;
  min-width: 100%;
  min-height: 100vh;
  background-position: center center;
  display: table;
}

.jumbotron {
  background-color: transparent;
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  padding: 0px;
  margin: 0px;
}

.container.tint {
  padding: 1.5em;
  background-color: rgba(255, 255, 255, 0.5);
}