table#col_table {
    width: 300px;
    border-collapse: collapse;
    table-layout: fixed;
}

table#col_table td {
    border: 1px solid #333;
    padding: 8px;
    text-align: center;
}

table tr:nth-child(1) td:nth-child(1) {
    background-color: red;
}table tr:nth-child(1) td:nth-child(2) {
    background-color: blue;
}table tr:nth-child(2) td:nth-child(1) {
    background-color: greenyellow;
}table tr:nth-child(2) td:nth-child(2) {
    background-color: cyan;
}table tr:nth-child(3) td:nth-child(1) {
    background-color: firebrick;
}table tr:nth-child(4) td:nth-child(2) {
    background-color: pink;
}table tr:nth-child(4) td:nth-child(1) {
    background-color: ivory;
}table tr:nth-child(4) td:nth-child(3) {
    background-color: navajowhite;
}