Making an image responsive challenge

Tell us what’s happening:
I am doing the making an image responsive challenge and the preview window is working correctly however when running the tests it says " // running tests Your responsive-img class should have a max-width set to 100% . // tests completed

Any ideas on if I have done this wrong or there is a bug in the challenge?

I even tried pasting the code from the get a hint solution and it still says the same thing

Your code so far

.responsive-img { max-width:100%; height:auto; } img { width: 600px; }

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Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/18.17763.

Challenge: Make an Image Responsive

Link to the challenge:

can you paste the whole code please??