html,body{
  width:100%;
  height:100%;
  margin:0;
  overflow:hidden;
  background:#000;
}

body{
  position:relative;
}

#bg-fallback,
#bg-frame{
  position:absolute;
  inset:0;
}

#bg-fallback{
  background:linear-gradient(135deg,#0a0e14,#050709);
}

#bg-frame{
  width:100%;
  height:100%;
  border:none;
}