Vertically Centering Text and HTML Elements With CSS

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Vertically centering something in CSS is not as easy as you'd think, and until we got tools like flexbox, it was really hard. Centering an item in the middle of the screen with CSS is really easy with flexbox. If we want it to be both centered vertically, and also centered horizontally, then we would update our `container` CSS to look like this:```csscontainer { display: flex; align-items: center;   justify-content: center.