html, body {
  margin:0;
  padding:0;
  width:100%;
  height:100%;
  overflow:hidden;
  background:#000000;
  font-family:Arial, Helvetica, sans-serif;
}
#game-wrap {
  width:100vw;
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background:#000000;
}
#game { width:100%; height:100%; }
canvas { display:block; margin:0 auto; image-rendering:auto; }

/* v7: kein Seiten-Hintergrundverlauf, alles schwarz */
html, body, #game-wrap, #game { background:#000000 !important; }