html, body {
  margin: 0;
  padding: 0;
  background: #1a1a22;
  color: #cfcfd8;
  font-family: "Segoe UI", Arial, sans-serif;
  height: 100%;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}
#shell {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
#frame {
  background: #000;
  padding: 0;
  line-height: 0;
  box-shadow: 0 0 0 6px #3a3a48, 0 0 40px #000;
  border-radius: 4px;
}
#screen {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  display: block;
  cursor: pointer;
  outline: none;
}
#help {
  margin-top: 14px;
  font-size: 12px;
  color: #8a8a99;
  text-align: center;
  padding: 0 12px;
}
#help b { color: #b8b8c8; }