@media (max-width: 979px) 
{
    [class*="span"],
    .row-fluid [class*="span"] {
        display: block;
        float: none;
        width: 100%;
        margin-left: 0;
    }
    .row-fluid a.btn.btn-primary.span4, a.btn.btn-block.btn-large.btn-primary{
        margin-bottom: 8px;
    }
}