html,body { margin:0; padding:0; height:100%; background:#000; color:#fff; font-family: 'Courier New', monospace; }
#hud { position: fixed; top:10px; left:10px; padding:8px 10px; }
#caption { opacity:0; transition: opacity .4s; font-size: 14px; margin-top: 4px; }
#canvas { width: 100vw; height: 100vh; }
.layer { opacity:0; transition: opacity .8s; }