CodePen Responsive images?

Does the img-responisve not work in codepen? Bootstrap is linked; img in a "col-md-*; thats in a “row”; thats in a “container.”

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check the version of bootstrap you’ve added.
For v4 there’s a different class.

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AHHHHHH! It all makes sense now. Not one told me this. lol ok thank you.

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Thank you so much for posting this (and OP for asking it)! I was really struggling to figure out why my images weren’t responsive.

Bootstrap v4 is still an alpha release, I am not sure why Codepen doesn’t give you a way to choose v3…
Anyway, it looks like the contributors are updating the curriculum to be more specific in using v3.