* {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 12;
}

td {
    border-width: 1px;
    border-color: black;
    border-style: solid;
    text-align: center;
}

.small {
    width: 100px;
    height: 100px;
}

.large {
    width: 200px;
    height: 200px;
}

.red {
    background-color: red;
}

.green {
    background-color: green;
}