It also works fine on Chrome inspect tools.
See the attached video - This is how it works on Android devices. But, tapping the scrollbar doesnt work on iPhones.
This should be a html/css/jquery issue so you can work on browser and then send me the code changes.
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If you just wanna fix this Section I can help you. But I've to tell you that the whole site have a huge bug in responsive code, you don't have problem with Iphone You have proprome with the most size screens and you can check it easy with Browser's inspect element.
So please tell me what exactly you need to be done.