How can I make my website scaleable?

I have created a simple website so far but now that I opened it on a different computer I noticed it’s not centered or scaled at all. I would love it if you could give me advice about how to scale it properly between devices.
Here is the code:

And here is a demo video of the website from my computer:

Media Queries are one of the best ways that you can scale your site across different devices.

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