body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background: #222;
    padding: 10px 0;
}
nav {
    text-align: center;
}
nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
}
nav a:hover {
    text-decoration: underline;
}
main {
    padding: 20px;
    max-width: 800px;
    margin: auto;
}
footer {
    background: #f4f4f4;
    text-align: center;
    padding: 15px;
    margin-top: 30px;
    font-size: 0.9em;
    color: #555;
}
form input, form textarea, form button {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}
form button {
    background: #222;
    color: white;
    border: none;
    cursor: pointer;
}
form button:hover {
    background: #444;
}