body {
    font-family: sans-serif;
    margin: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

main {
    padding: 1rem;
    margin: 0 auto;
    max-width: 800px;
}

article {
    background-color: #fff;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 5px;
}

footer {
    text-align: center;
    padding: 1rem 0;
    background-color: #333;
    color: #fff;
    position: fixed;
    bottom: 0;
    width: 100%;
}