#banner {
  background: url('https://images.unsplash.com/photo-1491841550275-ad7854e35ca6?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=1080&fit=max&ixid=eyJhcHBfaWQiOjEzMjQ5fQ') no-repeat center center;
  background-size: cover;
}