.jumbotron {
    background-size: cover;
    background-position: 50%;
    box-shadow: inset 0 0 0 1000px rgba(0, 0, 0, 0.6);
    height: 500px;
}

pre {
    color: #f8f8f2;
    background: #282a36;
    padding: 20px;
}