Hi,
the problem is that it's NOT our code, and it works as iframe. I suggest to ask on FR forums for webmasters / web designers. Maybe Google has guides for webdevelopers for that.
RAw HTML just display content inside, like Custom Joomla Module, nothing more.
For sure as quick tip I would REMOVE left padding in MObile view in Columns where you have Chars, it will give more space to display content :)

And inside iframe code change value in scrolling from "no" to "yes". It will help users to scroll left-right.