html, body {
  margin: 0;
  padding: 0;
  background: #0f1220;
  color: #f4f7ff;
  font-family: sans-serif;
}

.wrap {
  max-width: 320px;
  margin: 0 auto;
  padding: 16px;
  text-align: center;
}

canvas {
  display: block;
  margin: 16px auto;
  background: #171b2e;
  border: 1px solid rgba(255,255,255,0.12);
}

.controls {
  font-size: 14px;
  color: #b8c0d9;
}