How to Center a Middle Box Between Unequally Sized Side Boxes Using Only CSS?

Keeping the Middle Item Centered Amidst Unequal Side Items

Introduction

When designing layouts involving side-by-side boxes with varying widths, a common challenge is to maintain the centering of the middle box. This article explores a CSS solution to achieve this effect.

CSS Solution Using Flexbox

To center the middle box regardless of the side boxes' widths, we can leverage flexbox and auto margins:

Key Features

• Pure CSS: No additional libraries or JavaScript are required.
• No Absolute Positioning: Elements are positioned using flexbox, eliminating the need for absolute positioning.
• Dynamic Alignment: The middle box remains centered regardless of the widths of the side boxes.

Implementation Details

• The .container is a flexbox that wraps all three .box elements.
• Each .box is also a flexbox, with justify-content: center to align its inner content horizontally.
• flex: 1 causes each .box to grow to fill the available space equally.
• The margins on the inner elements ensure that the edges of the side boxes always touch the edges of their containers.
• Auto margins expand or shrink as necessary to maintain the centered alignment of the middle box.

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