* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #070d2e;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

#stage {
  position: fixed;
  inset: 0;
}

#stage canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#btn-install {
  position: fixed;
  left: 0;
  top: 0;
  width: 0;
  height: 0;
  display: block;
  padding: 0;
  border: 0;
  border-radius: 18px;
  background: transparent;
  color: transparent;
  font-size: 0;
  line-height: 0;
  -webkit-appearance: none;
  appearance: none;
  outline: none;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
  cursor: pointer;
  pointer-events: none;
  z-index: 2;
}

#btn-install.is-live {
  pointer-events: auto;
}