Why does this sidebar layout have the issue 'An input with width:100% plus padding is overflowing its parent.' and how do I fix it?

CSS Published 03 Oct 2026 Updated 03 Oct 2026 0 Views Verified

Problem: An input with width:100% plus padding is overflowing its parent. Context: This CSS troubleshooting question uses a sidebar layout example. Correct approach: Use border-box sizing so padding and borders are included in the declared width. Working CSS: *, *::before, *::after { box-sizing:border-box; }

Looking for the latest Sarkari Result 2026 updates? Check the latest government exam results, merit lists and result updates on Sarkari Resultess.

Answer & Explanation

4 Answers

Verified

A. Common but incorrect approach

Use width:calc(100% + 40px)

Additional Explanation

This approach does not directly implement the required CSS behavior.

Verified

B. Incorrect CSS alternative

Use box-sizing:content-box

Additional Explanation

This is not a valid CSS property or does not solve the stated problem.

Verified Correct Answer

C. Correct CSS solution

*, *::before, *::after { box-sizing:border-box; }

Additional Explanation

Use border-box sizing so padding and borders are included in the declared width.

Verified

D. Another incorrect approach

Use overflow:visible

Additional Explanation

This does not address the underlying CSS layout or styling issue.