body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f9f9f9;
  margin: 0;
  padding: 0;
  text-align: center;
}
header {
  background: #222;
  color: #fff;
  padding: 20px;
  font-size: 1.3rem;
  font-weight: 600;
}
.container {
  max-width: 600px;
  margin: 40px auto;
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,.08);
}
.cta-btn {
  display: inline-block;
  margin-top: 20px;
  background: #000;
  color: #fff;
  padding: 12px 28px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  font-size: 1rem;
}
.cta-btn:hover {
  background: #444;
}
.notice {
  margin-top: 15px;
  color: #555;
}