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Quick CSS Tip: Two-toned square join borders

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When you define a typical CSS border, the corners join together at a 45-degree angle:

example of normal CSS border join

border-width exaggerated for effect

Instead, we can use a combination of border and box-shadow to produce a square border join:

Open the Codepen to play around with the values, and set $insetBorder to false to place the bottom "border" below the left border.

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