html, body {
  margin: 0;
  overflow: hidden;
  height: 100%;
}

canvas {
  display: block;
  will-change: transform;
  cursor: crosshair;
}  

.fade-toggle {
  display: inline-block;
  opacity: 1;
  transform: translateY(0) scale(1);
  transform-origin: left top;
  transition: opacity 320ms cubic-bezier(0.2,0.8,0.2,1), transform 320ms cubic-bezier(0.2,0.8,0.2,1);
  will-change: opacity, transform;
}

.fade-toggle.hidden {
  opacity: 0;
  transform: translateY(-6px) scale(0.98);
  pointer-events: none;
}