.MainPanel 
{
    padding: 0.5em;
}

.MainDiv 
{
    overflow:auto; 
    overflow-y:hidden;
}

.StammdatenPanel 
{
   margin-top: 1em;
   margin-left: 0.5em;
   overflow-x:auto;
   display:inline-block;
   vertical-align:top;
   width:49%;
}