body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f2f2f2;
}
header {
  background-color: #333;
  color: white;
  padding: 10px 0;
  text-align: center;
}
header nav a {
  color: white;
  margin: 0 15px;
  text-decoration: none;
}
main {
  padding: 20px;
}
footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 10px 0;
}
form input, form textarea {
  width: 100%;
  padding: 8px;
  margin-top: 8px;
}
form input[type="submit"] {
  background-color: #5cb85c;
  color: white;
  border: none;
  cursor: pointer;
}