UI layout bug: File view page does not adapt to screen width on Android web

[zryyoung]

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Hello GitHub Support Team,

I would like to report a UI layout issue on GitHub Web when using an Android browser.

Description:
On the repository file view page, the overall UI layout does not properly adapt to the screen width on Android devices. The page leaves an unused blank area on the right side, and the main content area does not expand to fill the available viewport width.

The file content itself is scrollable horizontally and works correctly. The issue is with the page layout and width calculation, not with the file content rendering.
This bug only appeared recently.

Steps to reproduce:

1. Open GitHub.com in an Android web browser
2. Navigate to any repository
3. Open a file to view its details
4. Observe that the page layout does not fully utilize the screen width, leaving a blank area on the right

Expected behavior:
The UI layout should adapt to the device screen width and use the full available viewport.

Actual behavior:
The page layout width is constrained, leaving empty space on the right side of the screen.

Environment:

• Platform: GitHub Web (mobile browser)
• Device: Android phone
• Browser: [Chrome / Edge / Firefox / Other]
• Android version: [e.g. Android 16]

Additional information:
This appears to be a responsive layout issue rather than a file content rendering problem.
Screenshots can be provided to illustrate the unused blank space.

Thank you for your time and support.

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[H41s3]

Yes, what you’re seeing sounds like a responsive layout issue on GitHub Web for Android. The file content scrolls correctly, but the page width isn’t adapting fully to the viewport, leaving that blank space.

A few things you can try in the meantime:

Make sure your browser zoom is set to 100% and try rotating the device to see if the layout adjusts.

Clear the browser cache or try in an incognito/private window.

Update your browser to the latest version, as layout fixes are sometimes included in updates.

If it persists, this is likely something that needs to be fixed on GitHub’s side in their CSS/responsive layout. You can submit it directly to GitHub Support or open a bug report on their mobile web repository. Screenshots always help them reproduce the issue faster.

Local workarounds are limited, unfortunately, since it’s a UI responsiveness problem rather than a content issue.

[zryyoung]

When I mentioned this UI bug, did you test it on an Android device to see if the same problem occurred, instead of immediately blaming it on the user? I've clearly described the bug: when accessing the repository file and viewing its contents, the UI is abnormal. This happens with any browser on Android, as long as the interface is correct. Therefore, it's a problem with the GitHub website. I've attached screenshots. Please fix it promptly.

To reiterate, this will only appear when viewing the file content.
This is how it should normally be displayed.

[danbopes]

This is exactly what I'm seeing as well on Android. (Using Brave Browser on Pixel 8)

[quat1024]

@zryyoung you're talking to an LLM

[zryyoung]

What does this have to do with a UI bug? Wouldn't he encounter this bug if he used an Android browser to view the contents of the repository files?

[zelodev]

Can confirm and reproduce on my side. Extremely annoying..

[zryyoung]

It’s only been happening in the past few days; it wasn’t happening earlier.

[zelodev]

It’s only been happening in the past few days; it wasn’t happening earlier.

Yes, I looked for your issue before trying to submit my own

[ignacysokolowski]

It’s not only Android, also all browsers on iOS. It makes it almost impossible to read code.

[daredevil2033]

same issue
even worse actually

[quat1024]

Can reproduce by shrinking the browser window on desktop too. Real amateur hour stuff.

How's that AI vibe coding coming along Github :)

[danbopes]

CoPilot I guess assisted with this merge request.

[zryyoung]

Based on what you've said, if you can't even do these basic things well, how can you expect to do anything else well? Why did this problem appear this month when it didn't exist last month?

[zryyoung]

The bug where the UI for viewing file content automatically adjusts to the width has been fixed, but a bug has appeared in the UI for editing files.

Record_2026-01-21-05-53-10_a252b927494330cdc2c8ba3b3f952e5e.mp4

[zelodev]

Can confirm. I also see that some pages initially load in a desktop viewport then adjust to my actual viewport. This didn't exist beforehand iirc.