How to expand rows in Bootstrap when you resize the browser

I’m trying to create a Checkerboard. I made this:
What is frustrating me is that I can’t figure out how to make the “board squares” remain square- when you resize the browser the columns expand but not the rows. How can I make it so that the squares remain square?
(I realize that CSS Grid would probably be the better way to make a checkerboard but I was challenged to do it in Bootstrap so I’d like to figure out how, given it’s got to be pretty easy)

You can do that by make it responcive

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Is this what makes it responsive?
<meta name="viewport" content="width=device-width, initial-scale=1>

Hello there.

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Hope this helps

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