body {
    font-family: Arial, sans-serif;
    margin: 20px;
    padding: 20px;
}

header {
    text-align: center;
    padding: 10px;
    background-color: #f1f1f1;
        }
main {
    margin-top: 20px;
}

footer {
    margin-top: 20px;
    text-align: center;
    padding: 10px;
    background-color: #f1f1f1;
}