Reverse grid arrangment?

Question

I have a sidebar on the right and content on the left:

  
Main. At large zoom --          


        
      

Answer 1

Think mobile first. Put the column that on mobile will go up first. And use pull and push for larger screens.

  
Sidebar. At large zoom -- currently it goes to bottom. I want it to go to the top.



  
Main. At large zoom -- currently it goes to top. I want it to go to the bottom.