Change number of cols in Parallax Widgets

Hello,

I want to know, how its possible to change the number of the cols in the Parallax Widget. At the moment, the image has a col-md-7 and the text has a col-md-4 in the desktop version. I want to have the image 5 cols and the text 6. Would be nice if someone can tell me, where I can change that.

Greetings

Any ideas?