article {
    margin: 0 auto;
    width: 60%;
}

article > heading {
    border-bottom: 1px solid #e5e5e5;

    margin: 1.5em 0;
    padding-bottom: 1.5em;

    display: block;
    overflow: auto;
}

article > heading h1 {
    margin: 0;
}

.jumbotron {
    text-align: center;
}