body {
    font-family: sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f0f0f0;
}

h1 {
    text-align: center;
    width: 100%;
}

#bingo-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

.card-wrapper {
    text-align: center;
    background-color: white;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.bingo-card {
    border-collapse: collapse;
}

th, td {
    border: 1px solid black;
    width: 50px;
    height: 50px;
    text-align: center;
    font-size: 18px;
    cursor: pointer;
    user-select: none;
}

th {
    background-color: #ddd;
}

td.clicked {
    background-color: #4CAF50;
    color: white;
}

.free-space {
    background-color: #ccc !important;
    font-weight: bold;
}