CSS debugging: A box needs internal spacing while keeping its outer width predictable.. What is the proper fix for a registration form?

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

Problem: A box needs internal spacing while keeping its outer width predictable. Context: This CSS troubleshooting question uses a registration form example. Correct approach: Use padding with border-box sizing. Working CSS: .box { width:100%; padding:20px; box-sizing:border-box; }

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Answer & Explanation

4 Answers

Verified

A. Common but incorrect approach

Use margin:20px inside the box

Additional Explanation

This approach does not directly implement the required CSS behavior.

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B. Incorrect CSS alternative

Use outline:20px

Additional Explanation

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

Verified Correct Answer

C. Correct CSS solution

.box { width:100%; padding:20px; box-sizing:border-box; }

Additional Explanation

Use padding with border-box sizing.

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D. Another incorrect approach

Use border-spacing:20px

Additional Explanation

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