* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  width: 100vmin;
  height: 100vmin;
}

/* ── On-screen controls: tap or click, they press arrow keys / space ── */
#touch-controls button {
  position: fixed;
  z-index: 10;
  width: 58px;
  height: 58px;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  font-size: 22px;
  touch-action: none; /* stops taps from scrolling or zooming the page */
  user-select: none;
  cursor: pointer;
}

#touch-controls button:active {
  background: #ffd23e;
  color: #222;
}

#touch-controls .up    { left: 80px;  bottom: 132px; }
#touch-controls .left  { left: 16px;  bottom: 68px; }
#touch-controls .down  { left: 80px;  bottom: 68px; }
#touch-controls .right { left: 144px; bottom: 68px; }

#touch-controls .space {
  right: 24px;
  bottom: 76px;
  width: 88px;
  height: 88px;
  border-radius: 50%; /* the circle */
  font-size: 15px;
  letter-spacing: 1px;
}