table#markulesanne {
    border: 1px solid black;
    border-collapse: collapse;
    width: 250px;
    text-align: center;
    table-layout: fixed;
}

td, tr {
    border: 1px solid black;
    padding: 5px;
}

tr#col1{
    background-color: lightgray;
}
tr#col2{
    background-color: lightslategray;
}

tr#col3{
    background-color: slategray;
}

tr#col4{
    background-color: dimgray;
}

tr#col5{
    background-color: slategray;
}

tr#col6{
    background-color: darkgray;
}

.x {
    border-collapse: collapse;
    text-align: center;
}

.x td,tr {
    width: 50px;
    height: 30px;
    border: none;
}

.x td.must {
    background-color: black;
}