body {
  background: linear-gradient(120deg, #00c6ff 0%, #0072ff 100%);
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
  text-align: center;
}
h1 {
  color: #fff;
  margin-top: 32px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}
canvas {
  background: #222;
  border: 4px solid #fff;
  border-radius: 12px;
  margin-bottom: 16px;
  max-width: 98vw;
  height: auto;
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.controls {
  color: #fff;
  margin-bottom: 24px;
}
button {
  background: #fff;
  color: #0072ff;
  border: none;
  border-radius: 8px;
  padding: 10px 28px;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  margin-top: 8px;
  transition: background 0.2s;
}
button:hover {
  background: #00c6ff;
  color: #fff;
}
@media (max-width: 700px) {
  canvas { width: 98vw !important; height: auto !important; }
}