body {
  font-family: sans-serif;
  background: #0f0f1a;
  color: white;
  text-align: center;
  padding-top: 50px;
}

.roulette-container {
  max-width: 500px;
  margin: auto;
  background: #1c1c2e;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 15px #00f0ff;
}

button {
  padding: 10px 20px;
  font-size: 18px;
  margin-top: 20px;
}