body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background: #4CAF50;
    color: white;
    padding: 10px;
    text-align: center;
}
nav a {
    margin: 0 10px;
    color: white;
    text-decoration: none;
}
main {
    padding: 20px;
}
footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 10px;
    position: fixed;
    bottom: 0;
    width: 100%;
}
form {
    margin: 20px 0;
}
form input, form button {
    display: block;
    margin: 10px 0;
    padding: 10px;
    width: 100%;
    max-width: 300px;
}