body {
  margin: 0;
  font-family: Arial;
  background: #0f172a;
  color: white;
  text-align: center;
}

.container {
  margin-top: 100px;
}

h1 {
  color: #38bdf8;
}

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 15px 25px;
  background: #22c55e;
  color: white;
  text-decoration: none;
  border-radius: 8px;
}