body { margin:0; background:black; color:white; font-family:Arial; }
.portal { text-align:center; padding-top:50px; }
.crest { width:200px; animation: pulse 4s infinite; }
@keyframes pulse {
  0% { filter: drop-shadow(0 0 10px #0f0); }
  50% { filter: drop-shadow(0 0 25px #0f0) drop-shadow(0 0 10px gold); }
  100% { filter: drop-shadow(0 0 10px #0f0); }
}
.modules button { margin:10px; padding:10px 20px; }