:root {
  color-scheme: dark;
  background: #160202;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
  background: radial-gradient(circle at 50% 25%, #5b1111 0, #240505 50%, #100101 100%);
}

body {
  display: grid;
  place-items: center;
  touch-action: none;
}

#game-shell,
#embed-html {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
}

canvas {
  display: block;
  width: min(100vw, 56.25vh) !important;
  height: min(177.7778vw, 100vh) !important;
  max-width: 540px;
  max-height: 960px;
  outline: none;
  touch-action: none;
  box-shadow: 0 0 48px rgba(0, 0, 0, 0.55);
}