body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 0;
  background: #f5f5f5;
  color: #333;
}
header, footer {
  background: #222;
  color: white;
  padding: 1rem;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
}
nav ul li {
  display: inline;
  margin: 0 10px;
}
nav ul li a {
  color: white;
  text-decoration: none;
}
main {
  padding: 2rem;
}
form input, form textarea {
  display: block;
  margin: 0.5rem 0;
  padding: 0.5rem;
  width: 100%;
  max-width: 400px;
}