body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em;
}
section {
    max-width: 800px;
    margin: 2em auto;
    text-align: center;
}
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em;
    position: fixed;
    bottom: 0;
    width: 100%;
}
footer a {
    color: #fff;
    text-decoration: none;
}