body, tr {background-color:#FFFFFF; font-family: Arial, sans-serif; font-size: 13px;}
.titel1 {font-size: 120%; font-weight:bold; background-color:#e6e6fa; border: 5px solid #e6e6fa; text-align:center;}

<link rel="stylesheet" href="/fileadmin/template2020/css/losung.css">
<script>
 var hoehe = document['body'].offsetHeight + 20 + 'px';
 parent.document.getElementById('losung').style.height = hoehe;
 //alert(hoehe);
 //console.log(document['body'].offsetHeight);
</script>