body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 0;
  background: #f5f5f5;
  color: #333;
}
.hero {
  background: #0f172a;
  color: white;
  text-align: center;
  padding: 100px 20px;
}
section {
  padding: 60px 20px;
  text-align: center;
}
ul {
  list-style: none;
  padding: 0;
}