/* Sky */
#sky { position:fixed; inset:0; z-index:0; }
#c { position:fixed; inset:0; width:100%; height:100% }

/* App wrapper */
#app {
  position:fixed; inset:0; z-index:10;
  display:flex; flex-direction:column;
  align-items:center; justify-content:space-between;
}

/* Flash */
#flash {
  position:fixed; top:50%; left:50%;
  transform:translate(-50%,-50%);
  font-size:36px; color:rgba(255,255,255,.48);
  pointer-events:none; opacity:0; z-index:20;
  transition:opacity .25s;
}