:root {
  --bg0: #0b120c;
  --bg1: #131d12;
  --panel: rgba(16, 22, 16, 0.78);
  --stroke: rgba(255, 255, 255, 0.12);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.68);
  --accent: #ffd08a;
  --danger: #ff6b5a;
}

html,
body {
  height: 100%;
  margin: 0;
  background: radial-gradient(1200px 700px at 50% 25%, rgba(40, 64, 36, 1), var(--bg0));
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
  overflow: hidden;
}

#shell {
  height: 100%;
  display: grid;
  place-items: center;
}

#btn-fullscreen {
  position: fixed;
  right: 10px;
  bottom: 10px;
  z-index: 60;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  cursor: pointer;
  color: var(--accent);
  background: rgba(10, 16, 10, 0.72);
  border: 1px solid rgba(255, 208, 138, 0.28);
  border-radius: 6px;
  opacity: 0.65;
}

#btn-fullscreen:hover {
  opacity: 1;
}

canvas {
  display: block;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.50);
}