Elementary Theme Course Banner Sizes

I was playing a bit with the banner situation. It appears that if you upload an image in the Course Settings, that image will be used as the banner image in content courses. It auto-crops the center of the image for the course card. So with some experimentation, I have found that 1200 x 200 pixels works very well for the banner. And if you put some stuff right in the center of that size then you get about 350 x 200 pixels to work with. So the banner or hero image or whatever it's called looks like this:


And the corresponding Course Card image looks like this on the dashboard:


Here's a link to the banner I used in Canva if you want to play around with it: