body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  background: linear-gradient(135deg, #1a1a1a, #333);
  color: #f7f7fc;
  text-align: center;
}
header {
  background: #080813;
  padding: 20px;
}
nav a {
  margin: 0 15px;
  color: #0026ff;
  text-decoration: none;
}
iframe {
  width: 80%;
  height: 400px;
  margin: 20px auto;
  display: block;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(69, 116, 245, 0.5);
}
section {
  padding: 20px;
}