How to check if bootsrap is working on a website?

Question

Bootstrap

Website on local computer.
woocommerce plugin installed.
Here's the problem:
When I check the adaptation of product pages to a mobile view, the product image does not take its rightful place in the center, the recommended products also look bad...
The impression is that bootstrap does not work...
I made a child theme, of course created css, function.php.
True, I did not separately register the bootstrap connection.
How to test bootstrap to make sure it works, and if not, how to include it in a child theme?
Thank you.

Answer 1

chrome + f12
see styles