body {
  font-family: Arial, sans-serif;
  margin: 20px;
}

nav a {
  margin-right: 12px;
  text-decoration: none;
  color: #2563eb;
}

.hero {
  background: #f3f4f6;
  padding: 20px;
  margin-top: 20px;
}

.btn {
  display: inline-block;
  background: #2563eb;
  color: #fff;
  padding: 10px 14px;
  text-decoration: none;
}

.success {
  color: green;
  margin-top: 10px;
}

.error {
  color: red;
  margin-top: 10px;
}