I'VE been coding with zero sight for 20 years. I never mastered CSS for visuals. I just have no way of checking the output. So a good grounding in the theory, the ability to edit it, and use the parts that work for me (screen types, certain techniques like inserting things around elements etc( and I get sighted people to finish my looks. I can't justify risking client confidence when I can't see the final output.

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Sighted and CSS is hands down the most mundane thing anyone can learn if they don't know what they are doing. It takes small changes looking at the result and readjusting. Stuff occasionally goes where it is not wanted and it is basically web formatting and measuring. If his vision can't see clear shapes and elements on the screen it is next to impossible. To be good at it, he needs a sighted peer because it is like interior decorating a webpage.

Css is gross and often looks different on each browser