Is this the post that you are looking for: https://www.hometalk.com/1862869/easy-diy-bathroom-tank-tray?
If you don't want to build one, I've seen pretty ones listed on Amazon.
Debbie Stubbs! Why don't you just build one!! My friend!! Val? 😆 lol
I got one at Walmart in the bathroom accessories section.
Build one, purchase at Bed, Bath & Beyond, Home Goods, Ross, T J Maxx, Marshals, etc., or scads of places on line.