Why is there an unwanted right-side margin visible only on iPhone for a webpage?

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There could be several reasons why there's an unwanted right-side margin visible only on an iPhone for a webpage, including:

1. Device-specific issues: iPhones have different screen sizes and resolutions compared to other devices, so a webpage that looks fine on desktop or Android may not display correctly on an iPhone.

2. CSS and HTML issues: The webpage's design may not be optimized for mobile devices or may contain errors in the code that affect its display on iPhones.

3. Browser-specific issues: The iPhone's Safari browser may have certain quirks or bugs that cause a right-side margin to appear on certain webpages.

To fix this issue, you can try:

1. Using responsive design techniques to ensure that your webpages automatically adapt to different screen sizes and resolutions.

2. Reviewing your CSS and HTML code for errors or issues that may be causing the unwanted margin.

3. Testing your website on multiple devices and browsers to identify any inconsistencies or bugs.