Break text-lines when displaying smaller devices

Hi,

I recently created a blog with one of your themes and all is good except that something is not right with the responsive design, and I can’t seem to figure out what I did wrong. Can you please help me?

When displaying blog posts on smaller devices, the text in the main text block falls out of the page so a lot of text goes missing.

How can I set the text to break lines when displaying on smaller devices?

I attached a picture with an example of how it looks like.

Thank you in advance for your help.
/fs