body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
}

table {
    border-collapse: collapse;
    margin: 20px auto;
}

table, th, td {
    border: 1px solid #333;
}

td {
    width: 60px;
    height: 60px;
    text-align: center;
    vertical-align: middle;
    font-size: 18px;
    color: #333;
    background-color: #fff;
}

td:nth-child(odd) {
    background-color: #eaeaea;
}

.button-disabled {
    background-color: grey;
    color: white;
    cursor: not-allowed;
}