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

h1 {
    text-align: center;
    color: #333;
}

#kahoot-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.category {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.category h2 {
    margin-top: 0;
    color: #4CAF50;
}

.category a {
    display: inline-block;
    margin-top: 10px;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}

.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 10px 15px;
    background-color: #333;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}