html, body { margin: 0; width: 100%; height: 100%; background: #0c1020; overflow: hidden; }
body { display: grid; place-items: center; font-family: Arial, sans-serif; }
#game { width: 100vw; height: 100vh; display: grid; place-items: center; }
canvas { max-width: 100vw; max-height: 100vh; image-rendering: auto; box-shadow: 0 0 48px rgba(0,0,0,.35); }