body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.container {
    max-width: 800px;
    width: 100%;
    margin: 20px;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

header {
    text-align: center;
    margin-bottom: 20px;
}

header h1 {
    color: #333;
}

section {
    margin-bottom: 20px;
}

section h2 {
    color: #444;
    margin-bottom: 10px;
}

section p {
    color: #555;
}

.signup form {
    display: flex;
    flex-direction: column;
}

.signup label {
    margin: 5px 0 2px;
    color: #555;
}

.signup input, .signup select, .signup button {
    margin-bottom: 10px;
    padding: 8px;
    font-size: 16px;
}

.signup button {
    background-color: #007BFF;
    color: white;
    border: none;
    cursor: pointer;
}

.signup button:hover {
    background-color: #0056b3;
}

#ageDisplay {
    margin-left: 10px;
    color: #333;
}