CSS solution for An input with width:100% plus padding is overflowing its parent. in a admin panel: what code should I use?

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 admin panel 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; }

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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 Correct Answer

B. 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

C. 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

D. Another incorrect approach

Use overflow:visible

Additional Explanation

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