#block-jumbotron {
  height: 50vw;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  align-items: center;
  justify-content: center;
}
#block-jumbotron h1 {
  font-weight: 300;
  font-size: 40px;
}