body {
    font-family: Arial, sans-serif;
    background-color: #fafafa;
    text-align: center;
    padding: 20px;
}

h1 {
    margin-bottom: 30px;
}

#bingo-container {
    display: inline-block;
    margin-bottom: 20px;
}

#bingo-grid {
    border-collapse: collapse;
    margin: 0 auto;
}

#bingo-grid td {
    width: 140px;
    height: 100px;
    border: 2px solid #555;
    padding: 10px;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    background-color: white;
    transition: background-color 0.3s ease;
    font-size: 14px;
    line-height: 1.2em;
    text-align: center;
    border-radius: 8px;
}

#bingo-grid td.marked {
    background-color: #90ee90;
    color: #0b6000;
    font-weight: bold;
}

#reset-button {
    background-color: #3399ff;
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

#reset-button:hover {
    background-color: #2879cc;
}

#bingo-message {
    margin-top: 20px;
    font-size: 20px;
    font-weight: bold;
    color: #2e7d32;
}

.hidden {
    display: none;
}