have you set a viewport? https://www.w3schools.com/css/css_rwd_viewport.asp
I edited my site to be responsive some years back. Most things will shrink well enough, though s few of the pages can't because it would destroy the artistic vision/mechanics of the pages. I mostly just "care" that it looks good on anything from a desktop to a reasonably sized tablet.
Changing your div/frame sizes to percentages and using the viewport metatag that Bill suggested should be all you really need to do to make it responsive. It wouldn't be hard to do and besides, it's good edumication. :)
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