Try using the "max-width" style property : expected 'none' to not equal 'none'

Can someone help? I’m working on the Tribute Page and I’m getting an error in the layout section #1: “Try using the “max-width” style property : expected ‘none’ to not equal ‘none’”

There are many posts regarding this same error and I’ve looked at all of them. There seem to be many ways to solve this. How do I do this in CSS? And what exactly is: Try using the “max-width” style property : expected ‘none’ to not equal ‘none’?? Am I supposed to enter this as a style property? Sorry, I’m a total beginner and I’m dead in the water. Thanks very much.
Here’s a link to my code so far: https://codepen.io/jcamp622/pen/YzWMgLE

The “none” to not equal “none” is probably looking for you to have set the width of you image. (You need both a width and a max-width.) It could also be that you are missing the semicolon after your max-width: 100%.