Sidebar on mobile devices

Hi!
I use customizr in my blog, and I chose to have my sidebar on the right part. When I visit the blog on my cellphone the sidebar doesn’t display on the right, it’s below the content, which is fine, I like it to show that way on mobile devices so the content of the post is more appealing. The problem is that this doesn’t happen in my tablet(like in my pc, the sidebar appears on the right part of the blog). Is there a way to fix that and have the sidebar displayed below content when using tablets,as in cellphones? Thank you!