.impressum_einfuehrung
{
    padding: 0;
    margin-bottom: 25px; /* Ueberschreibt den ersten margin-top, Stichwort: Collapsing margins */
    margin-bottom: 1.5625rem;
}


@media (min-width: 540px)
{
    .impressum_links
    {
        margin-right: 1.5%;
        width: 42.5%;
        float: left;
    }

    .impressum_rechts
    {
        margin-left: 1.5%;
        width: 42.5%;
        float: left;
    }
}