body {
  font-family: sans-serif;
  line-height: 1.6;
  max-width: 700px;
  margin: 2rem auto;
  padding: 0 1rem;
}

nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #333;
}

form {
  margin-top: 1rem;
}

input, textarea, button {
  display: block;
  width: 100%;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
  padding: 0.5rem;
}