How can I resize a product video code for mobile and desktop?

[Lifegetseasy]

Hey all, I have this code (I am not a coder, just found helpful code via the internet) And the code is supposed to insert videos on the product page. However, the video is too big on desktop and mobile. I would like this code to like a 1080 x 1080 size where it's a square and can fit on the mobile screen ( where the user can scroll up and down and not left to right )  and on the desktop. 

<div style="text-align: center;"><video muted="true" width="100%" autoplay="autoplay" loop="loop" controls="controls" video="">
<source type="video/mp4" src="ENTER VIDEO FILE URL HERE"></video></div>

[Lifegetseasy]

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