body{
    margin: 0;
    padding: 0;
}

.jumbotron{
    height: 370px!important;
    background: url(./img/background.jpeg) no-repeat center center;
    background-size: cover;
}

.a:link, .a:visited, .a:hover{
    color: #fff;
}

@media (max-width: 767px) {
    .jumbotron {
        height: 640px!important;
    }
}