Code Guild is community devoted to continuous education. Here is a round-up of articles on CSS topics curated by Code Guild instructor, Andrew Hedges. Awesome List of Things to do with CSS https://www.sitepoint.com/you-can-do-that-with-css/ Writing more Meaningful Markup http://alistapart.com/article/meaningful-css-style-like-you-mean-it Writing Maintainable, Scalable, and Modular CSS http://maintainablecss.com/chapters/introduction/ A Different Perspective on the !important Declaration: it might be useful http://csswizardry.com/2016/05/the-importance-of-important/ Using the :not Pseudo-Class https://bitsofco.de/on-not-and-specificity/ Games to Practice CSS: Flex Box Froggy http://flexboxfroggy.com/ CSS Diner http://flukeout.github.io/ This is not a game – it is pure magic: CSS Centering Tool http://howtocenterincss.com/