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place-items is just a shorthand property that takes 2 arguments. The first argument sets the align-items value and the second argument sets the justify-content value. If only one argument is provided (as in this example), it sets both align-items and justify-content to that value.

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Actually, this is technically incorrect. It doesn't set justify-content, it sets justify-items. This is why it works with grid, and not flexbox

Source: https://developer.mozilla.org/en-US/docs/Web/CSS/place-items

I think there's a lot of confusion for most people between justify-content/justify-items and align-content/align-items

Ah, I see. Thanks!

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