div#koppelboxkolom1,
div#koppelboxkolom2,
div#koppelboxkolom3 {
    height: auto;
}

div.koppelbox {
    border: 1px solid #ececec;
}

div.koppelboxtitel, div.koppelbox h2 {
    border-bottom: 1px solid #ececec;
    background: #fff;
    font-size: 120%;
    font-weight: bold;
}