Personal Portfolio Webpage Media Query problems

Hello everyone, I completed the personal portfolio webpage project on FCC and began doing my own styling over on codepen. However, when I tried to optimize it for mobile it seems that the @media queries are not working for some reason. I used the same syntax and everything that I used for my previous project that did work, so I am completely at a loss as to why the @media queries didn’t work.

Here is a link to the codepen project:

Does anyone have any idea what’s going wrong here?

Thank you so much!

how are you testing the media queries?