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# System prepended metadata

title: HTML and CSS Reference

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# HTML and CSS Reference

here are a few little html/css snippets to copy if you want

## embedding

is easy, just paste in the embed code:

<iframe width="560" height="315" src="https://www.youtube.com/embed/_V10kWLh71U" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

you can also change the width and height if you want:

<iframe width="180" height="100" src="https://www.youtube.com/embed/_V10kWLh71U" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

## boxes

you can create gives 