body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    text-align: center;
}

header {
    background-color: #007BFF;
    color: white;
    padding: 20px;
}

section {
    margin: 20px;
    padding: 20px;
    background: white;
    border-radius: 5px;
    box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
}