body {
  font-family: sans-serif;
  max-width: 600px;
  margin: 2rem auto;
  padding: 1rem;
  line-height: 1.6;
}
h1, h2 {
  color: #333;
}
form input, form textarea {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 1rem;
}
form button {
  padding: 0.5rem 1rem;
  cursor: pointer;
}
nav a {
  margin-right: 1rem;
}