body {
  font-family: Arial, sans-serif;
  background: #1c1c1c;
  color: #f1f1f1;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  text-align: center;
  background: #2a2a2a;
  padding: 20px;
  border-radius: 12px;
  width: 400px;
  box-shadow: 0 0 15px rgba(0,0,0,0.7);
}

button {
  margin: 10px;
  padding: 10px 20px;
  font-size: 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

#rollBtn {
  background: #4CAF50;
  color: white;
}

#stopBtn {
  background: #f44336;
  color: white;
}