fix

js/interactive_grid.js

@@ -223,7 +223,7 @@ function drawBackgroundBefore() {
         const scale = Math.max(scaleX, scaleY);
 
         const newWidth = bgWidth * scaleX;
-        const newHeight = bgHeight * scaleY;
+        const newHeight = bgHeight * scaleX;
 
         const xOffset = (canvasWidth - newWidth) / 2;
         const yOffset = (canvasHeight - newHeight) / 2;
@@ -246,7 +246,7 @@ function drawBackgroundAfter() {
         const scale = Math.max(scaleX, scaleY);
 
         const newWidth = bgWidth * scaleX;
-        const newHeight = bgHeight * scaleY;
+        const newHeight = bgHeight * scaleX;
 
         const xOffset = (canvasWidth - newWidth) / 2;
         const yOffset = (canvasHeight - newHeight) / 2;