Markdown previewer feedback and help

I just built my markdown previewer and was looking for some feedback and some help. You can find my Markdown Previewer at this link.
The issue I’m having is that the button to maximise the preview window works fine but the animation looks weird (it goes to the right first before extending in width), so I was wondering if anyone could guide me on how to fix it.

I like your project very much ,Everything is working so fine and awesome .
Happy Coding man

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Looks great. I love it but try making it responsive to make it perfect.:smile: