body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
}

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

nav ul li {
    margin: 0 1rem;
}

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

main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

form {
    display: flex;
    flex-direction: column;
    max-width: 500px;
}

input, textarea {
    margin-bottom: 1rem;
    padding: 0.5rem;
}

button {
    padding: 0.5rem;
    background: #333;
    color: #fff;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #555;
}