body {
    font-family: Arial, sans-serif;
    background-color: #111;
    color: #f1f1f1;
    margin: 0;
    padding: 0;
}
header, footer {
    background-color: #222;
    padding: 1em;
    text-align: center;
}
nav a {
    margin: 0 1em;
    color: #0af;
    text-decoration: none;
}
main {
    padding: 2em;
}
form {
    display: flex;
    flex-direction: column;
    max-width: 400px;
    margin: auto;
}
form input, form textarea {
    margin: 0.5em 0;
    padding: 0.5em;
}