body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f0f0f0;
}
#chessboard {
    border: 2px solid #333;
    background-color: #e0c0a0;
    margin: 20px auto;
    display: block;
}
#room-info {
    margin: 20px;
    line-height: 1.8;
}
table {
    margin: 20px auto;
    border-collapse: collapse;
}
th, td {
    border: 1px solid #333;
    padding: 8px 20px;
}
button {
    padding: 5px 10px;
    margin: 5px;
}