I got a message that says:
"To use xxx , the CSS on your browser must be enabled"
I followed the instructions online that read:
- Open up DevTools ( Command + Option + I on Mac; Control + Shift + I on Windows)
 - Head over to DevTool Settings ( ? or Function + F1 on Mac; ? or F1 on Windows)
 - Click open the Experiments section.
 - Enable the CSS Overview option.
 
but when I go to the development tools there is not an option to choose css overview.
Development tools has no "enable CSS Overview" option.
Looks like you're following instructions for Chrome users... so I'm responding with an answer based on Chrome.
CSS Overview is no longer in Experiments.
It’s now available in the “More tools” submenu under the “⋮” menu.**

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