Help needed with responsive image step of tribute page

Hello, fellow campers! I’ve been working on the tribute website project today and am feeling mostly finished, with the exception of having trouble getting the responsive image step to pass the tests. I have tried a few different methods, but the one I have currently set in my pen is what I was pretty certain would work. The test tells me otherwise though. Here is a link to my pen:
Any advice would be greatly appreciated.
It’s not the most attractive page ever either, so any other input on layout, design, etc is welcome.
Thanks in advance!