table#kalender {
        background-color: #EFEFEF;
        border: 3px solid #666666;
        border-collapse: collapse;
        empty-cells: show;
    }

    table#kalender td {
        width: 16px;
        height: 12px;
        text-align: right;
    }

    table#kalender td.tage {
        border-bottom: solid 1px #666666;
        background-color: #cccccc;
        width: 16px;
        height: 12px;
        text-align: center;
    }

    table#kalender td.aktivitaet {
        background-color: #FFFF80;
        width: 16px;
        height: 12px;
    }

    table#kalender td.heute {
        background-color: #FFCC66;
        color: red;
        font-weight: bolder;
        width: 16px;
        height: 12px;
    }