Making New Page Rersponsive

Hi. I’m doing as job on the IMITHEMES “Native Church” theme. A clean and fully responsive theme. In preparation for integrating some new pages I activated Jetpack’s “mobile option”. However, my 3 new pages look good on pc but not so good on mobile.
http://lightcircleministries.org/music-and-poetry/
http://lightcircleministries.org/poetry-draft/
http://lightcircleministries.org/music-videos/

I could try fiddling around with more plug-ins but I’m also learning CSS HTML5 coding and thought I should learn coding for mobile which I understand is fairly straightforward to do.

Any suggestions for an immediate fix to the problem in my pages would be greatly appreciated (even a plugin) as well as guidance on an in-depth look at the subject.

Cheers