Changed x to const

src/app.js

@@ -137,7 +137,7 @@ HTML.slider.oninput = function() {
   canvas.setStrokeRadius(this.value / 10)
 }
 
-var x = window.matchMedia(
+const x = window.matchMedia(
   "only screen and (orientation: landscape) and (max-width: 600px)",
 )
 x.addListener(() => {