body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f8;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    text-align: center;
    max-width: 900px;
    padding: 20px;
}

header {
    color: #333;
    margin-bottom: 30px;
}

.quiz-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.quiz-card {
    background-color: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    cursor: pointer;
}

.quiz-card:hover {
    transform: scale(1.05);
}

.quiz-card button {
    background-color: #5D3FD3;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    margin-top: 15px;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: 20px;
    border-radius: 10px;
    width: 70%;
    max-width: 600px;
    position: relative;
}

.close-btn {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}