How to keep elements of different background colors consistent in width?

How to make the width of elements of different background colors consistent?

Many front-end developers have encountered this problem: two elements on the page, with red and blue backgrounds, but different widths. How to make them consistent in width? Especially when element widths are not fixed, the problem is even more difficult. The following figure shows a typical scene: a blue background element and a red background element, both of which have neither fixed width.

The key to the problem is that the actual width of the blue element includes padding. The solution is to remove the inner margin of the blue element and apply this inner margin to the red element.

Set the padding value of the blue element to 0 to eliminate its influence on the width. Then apply the padding value before the blue element to the red element, which ensures that the two elements are visually consistent in width, even if the actual width is determined by the content. This method is simple and effective, avoiding complex calculations and layout adjustments.

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