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Here is lesson overview for unit 3 day 8 to 10 basic css. 
I did a very quick 10 day web design unit in my semester course. So I used the online tutorial quite a bit and just gave a couple of short assignments. Then I had students create a website using WordPress to make digital portfolios for the Scratch unit.
Here are some great resources I’ve found from other teachers and some I’ve made myself for U3 Day 8-10:
Adding CSS Tutorial website link - http://www.w3schools.com/css/css_syntax.asp
Intro to CSS website link - http://www.yourhtmlsource.com/stylesheets/introduction.html#whatarestylesheets
CSS Cheat Sheet website link - http://www.nhsdesigns.com/pdfs/web_css_cheat-sheet.pdf