<!--
    .leftGroup {
        float: left;
        width: 50%;
    }  
    .rightGroup {
        float: right;
        width: 50%; 
    }

#group {
}
    :after.group {
        content:"";
        display: table;
        clear: both;
    }
    @media screen and (max-width: 640px) {
        .leftGroup, .rightGroup {
            float: none;
            width: auto;
        }
    }
}

-->