Ask HN: Suggest open source projects where I can contribute and learn CSS

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Hi,

I am experienced backend engineer trying to dip my foot into frontend engineering. CSS is proving to be my achilles heal. I tried various courses, understand all the theory, tried copying stuff from jsfiddle etc, but I am still bad at making good looking websites. I realized that I need a mentor. So,I want to contribute to an open source project which needs CSS/JS/HTML work preferably lead by an experience frontend engineer who can guide me but is pressed for time otherwise.

If you know any such projects, please post here (with URL/contact information)