pre.code {
    border-style:solid;
    border-color:black;
    border-width:1px 3px 3px 1px;
    margin-left:2cm;
    margin-right:2cm;
    padding:1ex;
    background:#FFFFE0;
}

div.zitat {
    border-style:solid;
    border-color:black;
    border-width:1px 3px 3px 1px;
    margin-left:2cm;
    margin-right:2cm;
    padding:1ex;
    background:#DEDEDE;
}