* {
  margin: 0;
  padding: 0;
}

#GameOrientation {
  position: fixed;
  padding: 0;
  border: 0;
  touch-action: none;
  user-select: none;
  /* fix bug: hide cocos scrollbar */
  overflow: hidden;
  box-shadow: 0px 10px 20px #040714a6;
  opacity: 0;
  transition: opacity 0.5s;
}

#GameBackground {
  position: fixed;
  height: 100%;
  width: 100%;
  background-image: none;
  background-repeat: round;
  background-size: cover;
  opacity: 0;
  filter: brightness(1);
  transition: opacity 0.5s, background-image 1s, filter 0.5s;
}

canvas {
  /* fix bug: hide canvas before load */
  width: 0;
  height: 0;
  /* fix bug: hide browser selected outline */
  outline: none;
}