body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
  background: #f6f9fc;
  color: #333;
}

header {
  background: #0d9488;
  color: white;
  padding: 1rem 0;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 1rem;
  font-weight: bold;
}

nav a:hover,
nav a.active {
  text-decoration: underline;
}

main {
  padding: 2rem;
}

button {
  padding: 0.6rem 1.2rem;
  border: none;
  background-color: #0d9488;
  color: white;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background-color: #0f766e;
}

footer {
  background: #0d9488;
  color: white;
  padding: 1rem;
  margin-top: 2rem;
}