body {
  font-family: Arial, sans-serif;
  background: linear-gradient(to right, #00c6ff, #0072ff);
  color: white;
  text-align: center;
  padding: 50px;
}
.container {
  background: rgba(0,0,0,0.5);
  padding: 30px;
  border-radius: 15px;
  display: inline-block;
}
.btn {
  background: #ffcc00;
  padding: 15px 30px;
  border: none;
  border-radius: 10px;
  font-size: 18px;
  cursor: pointer;
}
.btn:hover {
  background: #ffaa00;
}