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

html, body {
  width: 100%;
  height: 100%;
  background: #0a0a0f;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  font-family: 'Courier New', Courier, monospace;
  color: #00ff41;
}

#gameCanvas {
  display: block;
  width: 100vw;
  height: 56.25vw;
  max-height: 100vh;
  max-width: 177.78vh;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  border: 1px solid #1a2a1a;
  box-shadow: 0 0 40px rgba(0, 255, 65, 0.15), 0 0 80px rgba(0, 255, 65, 0.05);
}