fix(#2198): prevent sidebar-only takeover at tablet widths (768px width) and zoom

[gmarav05]

Prevent sidebar-only view at 768px

closes #2198

Description

This PR fixes a responsive layout issue where the left sidebar could take over the page around 768px width (especially with browser zoom), making main content hard to access.

What I changed

• Updated assets/css/custom.css.
• Added a tablet/mobile CSS guard for .hextra-sidebar-container (max-width: 1023.98px).
• Set fixed position and height so it behaves like a proper drawer.
• Ensured main content (article) keeps width: 100% and min-width: 0.

Result

At 768px, the layout no longer gets stuck in a sidebar-only state.

License

The software is provided under AGPL-3.0. Contributions to this project are accepted under the same license.

[mrjones-plip]

thanks for the PR @gmarav05 !

While the PR was quick, please be more thorough in your testing:

• the nav bar is hidden, you can't access it
• there's a "system" theme selector in the upper left and it persists through out all responsive modes, introducing regressions. this shouldn't be shown until you click the hamburger menu
• speaking of which, the hamburger menu, search and other top icons are not in the mobile responsive mode
• I don't think we need any color change needed - can you explain why you added this?
• the media detection width of 1023.98px seems suspicious - why did you choose this value?

while a relatively small PR, I suspect the final PR will be even smaller that fixes where two @media and non-@media CSS declarations don't quite overlap.

please try again

[gmarav05]

Thanks for the detailed review @mrjones-plip . You’re right, my CSS fix was too broad and caused regressions.

Now i have made some updates:

• Removed sidebar override and theme/color changes .
• Applied minimal breakpoint fix at md boundary.
• Re-tested at 767/768/769 with zoom and menu scenarios.

[gmarav05]

[mrjones-plip]

Thanks @gmarav05 !

Since the hide/show feature of navigation should never be visible at the 768p width, I've removed it from this PR since it's not needed

[gmarav05]

yeah sure @mrjones-plip, Thank you for making that change and for your feedback.