dos

Public/static/js/common.js

@@ -183,8 +183,8 @@ Particle.prototype = {
         this.vy += this.gravity;
         this.y += this.vy;
         this.alpha -= 0.01;
-        if (this.x <= -this.w || this.x >= screen.width ||
-            this.y >= screen.height ||
+        if (this.x <= -this.w || this.x >= canvas.width ||
+            this.y >= canvas.height ||
             this.alpha <= 0) {
             this.alpha = 0
             return false;