creating a calculator

In gpt chat I asked how to program a calculator in htmo, css and java script and it looks beautiful in codepen, but in the android studio emulator it looks a disaster.

I’m new, what am I doing wrong?

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Look at it in an actual browser, that’s the only true way to see what an end user sees. Though you may need to chec in more than one.

Have a look at this one…

…believe it or not it is not made with any images.