body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0b0f1a;
  color: #ffffff;
}

header {
  background: #111827;
  padding: 20px;
  text-align: center;
}

nav a {
  margin: 0 10px;
  color: #9ca3af;
  text-decoration: none;
}

nav a:hover {
  color: #ffffff;
}

main {
  padding: 40px;
  max-width: 900px;
  margin: auto;
}

footer {
  background: #111827;
  text-align: center;
  padding: 20px;
  margin-top: 40px;
}