body {
    font-family: sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
}

.container {
    text-align: center;
    padding: 20px;
}

h1 {
    margin-bottom: 20px;
}

#bingo-card {
    display: grid;
    grid-template-columns: repeat(5, 1fr); /* Changed to 5 columns */
    grid-gap: 5px; /* Reduced gap */
    width: 300px;
    margin: 0 auto 20px;
}

.bingo-cell {
    background-color: white;
    border: 1px solid #ddd;
    padding: 10px; /* Reduced padding */
    text-align: center;
    font-size: 0.9rem;
    cursor: pointer;
    height: 40px; /* Reduced height */
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 5px;
}

.bingo-cell.found {
    background-color: #aaffaa;
    text-decoration: line-through;
}

button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.bingo-cell.free-space {
    background-color: lightblue;
    pointer-events: none;
}