@media screen and (min-width: 70em) {
    body .container {
        max-width: 1200px;
        margin-left: auto;
        margin-right: auto;
    }

    body #primary {
        display: flex;
        flex-direction: row;
        align-content: space-between;
    }

    body #primary > .site-main {
        flex-grow: 3;
        flex-shrink: 3;
    }

    body #primary > #secondary {
        flex-grow: 0;
        flex-shrink: 0;
        margin-left: 4%;
        margin-bottom: 1em;
        width: 30%;
    }

    body .site-header + * {
        padding-top: 0;
    }
}