.jumbotron {

//    background-image: url("/images/Explore_NASA_Goddard2015-group-bannercrop.jpg");
    background-image: url("/images/ChromaticsJamminJava2015-bannercrop.jpg");
    background-color: #17234E;
    margin-bottom: 0;`enter code here`
    min-height: 50%;
    background-repeat: no-repeat;
    background-position: center;
    -webkit-background-size: cover;
    background-size: cover;
}