hide cursor only when puzzle is loaded already

game/game.js

@@ -374,6 +374,7 @@ async function main() {
   fireworks.init(canvas)
 
   const ctx = canvas.getContext('2d')
+  canvas.classList.add('loaded')
 
   // initialize some view data
   // this global data will change according to input events

game/style.css

@@ -116,7 +116,7 @@ a:hover { color: var(--link-hover-color); }
   cursor: pointer;
 }
 
-canvas {
+canvas.loaded {
   cursor: none;
 }