body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 20px;
    background-color: #EFDED9; /* 茶色背景 */
}

.container {
    width: 80%;
    max-width: 720px;
    min-width: 540px;
    margin: 0 auto;
    text-align: center;
    background-color: #fff;
    padding: 20px 20px 60px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

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

td {
    width: 80px;
    height: 80px; 
    border: 1px solid #000;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    padding: 10px;
    font-size: 16px; 
    position: relative;
}

td.clicked::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 60px;
    height: 60px;
    border: 4px solid red;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-sizing: border-box;
}


.bingo-card {
    border: 2px solid #000;
    padding: 10px;
    display: inline-block;
}