I've been busy this week with my 4th grand-daughter arriving on the scene but I still found a little time to find some interesting CSS links.
Dudley Storey parallax demo with css and one line of JS.
How to keep up to date on front end web technologies.
More flexbox lessons
CSS3 generator tool.
Lastly two interesting links from recent SitePoint newsletters if you missed them
Document your device bugs
How to use mobile emulation mode in Chrome.
You can also view a list of previous posts here.