body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 2rem;
  background: #f9f9f9;
  color: #333;
}
.container {
  max-width: 800px;
  margin: auto;
  text-align: center;
}
h1 {
  color: #2c3e50;
}
.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 24px;
  background-color: #3498db;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}
.btn:hover {
  background-color: #2980b9;
}
img.banner {
  width: 100%;
  max-width: 720px;
  margin: 20px auto;
  display: block;
  border-radius: 8px;
  box-shadow: 0 0 12px rgba(0,0,0,0.1);
}