Trying to make theme fit on page to eliminate need to scroll right

I’m currently using theme “Loturuo”. Love the theme, but I hate that it doesn’t fit onto one page. I’ve viewed it in different browsers, and in every browser you have to scroll right. I am such a beginner at this, so I don’t really know what I’m doing. I’ve tried to play around with some of the code, but nothing I do gets the content to fit on one page.

Can someone please tell me what I need to do to accomplish this? In case it helps, my website is kayrenee.com