https://picocss.com/
https://css-tricks.com/lets-look-50-interesting-css-properties-values/
https://wattenberger.com/blog/css-percents
https://css.gg/
https://ciar4n.com/izmir/index.html
https://michalsnik.github.io/aos/
https://flexboxfroggy.com/#fr
https://www.sitepoint.com/our-top-9-animation-libraries/
http://www.ilikepixels.co.uk/drop/bubbler/
https://tabler.github.io/
https://purple3.herokuapp.com/
http://yoksel.github.io/flex-cheatsheet/
https://dansup.github.io/bulma-templates/
http://bulma.io/
https://getuikit.com/
http://youmightnotneedjs.com/
http://razvancaliman.com/css-for-decoration/#/
https://davidwalsh.name/css-facts
http://browserhacks.com/
http://tagliala.github.io/vectoriconsroundup/
http://csstriggers.com/
http://pingendo.com/
http://pixelastic.github.io/css-flags/
http://milligram.github.io/
http://www.paulfleury.fr/workflow-bootstrap-sass-avec-gulp-et-bower/
http://leaverou.github.io/awesomplete/
https://github.com/IonicaBizau/gridly
http://www.sitepoint.com/top-9-animation-libraries-use-2016/
https://codyhouse.co/gem/stretchy-navigation/
http://clippings.github.io/layout-grid/
http://startbootstrap.com/
https://css-tricks.com/debugging-css-keyframe-animations/
https://cssanimation.rocks/
http://fr.slideshare.net/NicoPennec/45-toolstoboostyourfrontend
http://devdocs.io/
http://davidl.fr/typography.html
http://ianlunn.github.io/Hover/
http://daneden.github.io/animate.css/
http://getskeleton.com/
http://mobileangularui.com/
http://semantic-ui.com/
http://deercreation.fr/article/creer-une-grille-css-responsive
http://leaverou.github.io/animatable/
http://www.paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-neither/
http://blog.adrien-gallou.fr/2014/10/20/webfonts.html
http://www.smashingmagazine.com/2014/10/16/css-only-solution-for-ui-tracking/
http://browserdiet.com/fr/
http://bootflat.github.io/
http://www.weloveiconfonts.com/
http://cssarrowplease.com/