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

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
}

section {
    margin: 20px;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 10px;
}