Hi! If you're referring to the icons, you should be able to ctrl+f for img and change the width and height values to what you're wanting. The "about" icon is set to 100x100 but all the "game" icons are set to 70x70. Changing these values should automatically adjust everything else to make it look correct.

Hope this helps! Let me know if you have a problem with it.

But if you meant the main background image/making the actual box larger, let me know! That'll be a little more involved but we can get through it!