*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #0a0a1a; }
#game-container { width: 100vw; height: 100vh; display: flex; align-items: center; justify-content: center; }
#game-container canvas { display: block; }