add line to sidebar on blog with avia layout builder

Hi Team – i’m hoping you can help me..

I’ve gone and created a blog page using the page layout builder to make it look like the default view with a blog and sidebar…see here

I did this becuase the title area needs to be centred above the content and sidebar areas…by default the theme has it to the left.

I need to add a divider line between the content and sidebar to this page so it looks like this (see the screenshot here)

http://www.awesomescreenshot.com/image/1213522/9a3f2a02ed4c1f7025166c94e7682aed

However it looks pretty tricky using the layout builder….

sooooo, I’m wondering
a) is there anyway to resolve this with the layout builder as it is
b) if not – is there a way I can change the blog theme template to have the title and the text under it display as it currently is – being at the top centred and with some text under it?

I feel like approach b) above is probably the best? What do you think?
I’m using a child theme so I can change template files or functions files…let me know…

cheers