html, body {
  margin: 0;
  height: 100%;
  background: #0d0f22;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

#game {
  display: block;
  width: min(100vw, calc(100vh * 16 / 9));
  height: auto;
  aspect-ratio: 16 / 9;
  background: #1a1d3a;
}

#cert-name {
  position: absolute;
  box-sizing: border-box;
  padding: 0 0.6em;
  border: 3px solid #ffb347;
  border-radius: 8px;
  background: #fffbe9;
  color: #3a1a0a;
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  font-weight: bold;
  outline: none;
}