body {
  background: black;
  color: #0f0;
  font-family: monospace;
  text-align: center;
  margin: 0;
  padding: 0;
}
canvas {
  display: block;
  margin: 0 auto;
  background: #111;
  border: 1px solid #0f0;
}
.controls {
  margin-top: 10px;
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}
label {
  font-size: 14px;
}