body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f8ff;
    color: #333;
    text-align: center;
}

#welcome-page, #test-page, #result-page {
    max-width: 600px;
    padding: 20px;
    border-radius: 10px;
    background-color: #fff;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}

h1, h2 {
    color: #4CAF50;
}

button {
    padding: 10px 20px;
    margin-top: 20px;
    font-size: 18px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background-color: #4CAF50;
    color: white;
}

button:hover {
    background-color: #45a049;
}

table {
    width: 100%;
    margin: 20px 0;
    border-collapse: collapse;
}

th, td {
    padding: 10px;
    border: 1px solid #ddd;
    text-align: center;
}

#feedback {
    margin-top: 10px;
    font-size: 16px;
}