Tesseract Theme with Page Builder plugin – my pages are not responsive

Hi!

I know that this question has been answered a few times, and I’ve found some threads about it. The thing is, I’ve started building my own pages 2 days ago, so I don’t really know what to do with the codes give and where to find them.

Anyway, my site http://medicel.si/ is not responsive. On my laptop the text is exactly on the waterfall, while for everyone else its different. On mobile its even worse, although I don’t really care much about that, since our clients are older and don’t use them to sign up for our events. But I would very much like it if everyone would see on their PCs exactly what I set.

Thank you in advance for any help!