.jumbotron {
  background-image: url("img/about.jpg");
  background-size: cover;
  height: 100%;
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .jumbotron {
    background-image: url("about.jpg");
    background-size: cover;
    height: 100%;
  }
}

h1 {
  color: #000000;
}