#exitFullscreenBtn{
  touch-action:manipulation;
  transition:transform .2s ease,box-shadow .2s ease;
}
#exitFullscreenBtn:focus-visible{
  outline:3px solid rgba(255,255,255,.9);
  outline-offset:4px;
}
#exitFullscreenBtn.is-fullscreen svg{
  transform:rotate(180deg);
}
#exitFullscreenBtn svg{
  transition:transform .22s ease;
  pointer-events:none;
}