#Voorvertoning
{
    float:left;
    margin-left:25px;
    margin-top:10px;
    margin-bottom:20px;
    border-style:solid;
    border-width:1px;
    border-color:#686868;
    padding:10px;
    width:730px;
}

#HTMLcode
{
    float:left;
    margin-left:25px;
    margin-top:10px;
    border-style:solid;
    border-width:1px;
    border-color:#686868;
    padding:10px;
    width:730px;
}