Thanks for your reply. I corrected that p tag.
I have resorted to modifying the classic theme, as it is the only one that does not push the sidebar to bottom. I am pleased with the result, and will continue to tweak.
For any who find this post relevant, please visit the link below for dissection of a theme. This author writes clearly and concisely. Go through his tutorials and you will then be able to modify or create themes confidently:
https://www.urbangiraffe.com/themes/guides/
Unfortunatley, even following the tutorial, sidebar psuhed to bottom. You may have better experience.