/* DEFAULTS */

body {
    font-family: georgia, serif;
}

.navbar {
       margin-bottom: 0; 
}

/* HELPER CLASSES */

.align-center {
    text-align: center;
}

/* DEFAULTS */

body {
    font-family: georgia, serif;
}

.navbar {
       margin-bottom: 0; 
}

.jumbotron {
    background-image: url(../img/dummy.jpg);
    -webkit-background-size: cover;
    background-size: cover;
    background-position: center;
}

/* HELPER CLASSES */

.align-center {
    text-align: center;
}

Add bg image to jumbotron
Add bg image to jumbotron
