body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #111827;
  color: #f9fafb;
}

main {
  max-width: 800px;
  margin: 100px auto;
  padding: 24px;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}