body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    color: #333;
    margin: 0;
    padding: 0;
}
header {
    background: #424a56;
    color: white;
    padding: 1em;
    text-align: center;
}
main {
    padding: 2em;
}
footer {
    background: #424a56;
    color: white;
    text-align: center;
    padding: 1em;
    position: fixed;
    width: 100%;
    bottom: 0;
}