@media (max-width: 768px) {

    #maincontent .row-fluid:nth-child(1) .span8 {
        margin-bottom: 1em;
    }

    #maincontent .row-fluid:nth-child(4) .span4:not(:last-child) {
        margin-bottom: 2.5em;
    }

    p.columns3 {
        column-count: 1;
    }
}