body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f9f9f9;
}

header, footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1em 0;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    background: #444;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    text-decoration: none;
    color: #fff;
}

main {
    padding: 20px;
}

h1, h2, h3 {
    color: #444;
}

form input, form button {
    margin-top: 10px;
    padding: 10px;
    width: 100%;
    max-width: 300px;
}