Nimp solved his problem on media queries.
But still i am leaving my experience in solving my problem with media queries. Just doing it for other campers so that they can be helped from this.
I was doing my Technical Documentation Project in my own environment, not on codepen.io. I added the CDN link with my code so that i could test it at any environment. But, even after adding media queries to my CSS , neither Firefox nor Chrome detected my media queries , when they were run into those browsers. I checked for bugs but it was bug free. I was always getting 15/16.
Then, i copy-pasted my code from my code editor and ran it in codepen.io then finally my media queries got detected and i got all the tests passing. Though by then, Chrome and Firefox would still give me 15.
I guess this will help. Happy Coding!!