CSS Guru

CSS BASIC

• https://developer.mozilla.org/en-US/docs/Web/CSS
• https://www.w3schools.com/css/
• https://hellolaravel/mk/developer/css
• http://marksheet.io/

CSS MASTER

• http://cssreference.io/
• https://github.com/sotayamashita/awesome-css
• http://www.cssmatic.com/
• http://caniuse.com
• https://codepen.io
• http://cubic-bezier.com/#.17,.67,.83,.67
• http://css3menu.com/builder/
• https://uigradients.com/#SunontheHorizon
• https://google.github.io/styleguide/htmlcssguide.html

News/blog

• https://css-tricks.com/
• https://webdesign.tutsplus.com/tutorials/search/css
• https://cssauthor.com/
• https://tympanus.net/codrops/?s=css&search-type=posts
• http://www.cssportal.com/

validation

• https://csstree.github.io/docs/validator.html