Why does the font get smaller at the smallest screen sizes?

I was reviewing my project here: https://codepen.io/partum/full/BazZrLZ
and I noticed that at screen sizes 317px and smaller, the text stops breaking and starts getting smaller. I am wondering why this is. What makes the page behave so differently all of a sudden.

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Can’t replicate this, how are you testing it?

I’m testing using the dev tools in Chrome.
I think the issue is something to do with the size of the tabs.

Does it seem like something the browser is doing? That’s a very small space, maybe it’s just rendering it at a smaller resolution?