.jumbotron {
    background-image: url("../img/battle_of_dunbar.jpg");
    background-color: #fffff;
margin-top: 0;
    margin-bottom: 0;`enter code here`
    
min-height: 50%;
color: #fff;

    background-repeat: no-repeat;
    background-position: center;
    -webkit-background-size: cover;
    background-size: cover;
}