body {
  background: #111;
  color: white;
  font-family: Arial;
  text-align: center;
  padding: 20px;
}

.controls {
  width: 90%;
  max-width: 400px;
  margin: auto;
  text-align: left;
}

.controls label {
  display: block;
  margin-top: 10px;
}

input[type=range] {
  width: 100%;
}

canvas {
  margin-top: 20px;
  max-width: 95%;
  border: 1px solid #555;
}

button {
  margin-top: 20px;
  padding: 10px 20px;
  background: #1e90ff;
  border: none;
  color: white;
  font-size: 18px;
  border-radius: 6px;
}