Hello!
I am currently working on the Responsive Web Design challenges (Technical Documentation) and I have some troubles with the major update of today.
In the CSS panel - when I write CSS instructions in the “style.css” panel, the preview doesn’t change. I do this challenge on Chrome.
Am I the only one concerned ?
Thanks!
You will need to link your stylesheet to your HTML. 
The new courses go over this, but MDN also has examples.
Thanks! I was used to code in CodePen… And it was not necessary
This is true!
CodePen does quite a few things for you behind the scenes, and one of our goals when we started designing this new curriculum and editor was to make things mirror a local development environment as much as possible. 
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