Add 'CSS'

CSS.md

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+## CSS
+
+* [Hello CSS](https://www.internetingishard.com/html-and-css/hello-css/);
+
+* [CSS reset](https://necolas.github.io/normalize.css/)
+
+* [CSS Units](https://www.w3schools.com/CSSref/css_units.asp)
+
+* [Font Formats](https://www.w3schools.com/css/css3_fonts.asp)
+
+* [Box Model](https://www.internetingishard.com/html-and-css/css-box-model/)
+
+* [FlexBox](https://www.internetingishard.com/html-and-css/flexbox/)
+
+* [Positioning Elements](https://www.internetingishard.com/html-and-css/advanced-positioning/)
+
+* [Z Index](https://developer.mozilla.org/en-US/docs/Web/CSS/z-index)
+
+* [Selectors](https://www.w3schools.com/cssref/css_selectors.asp)
+
+* [Prefixes](https://css-tricks.com/how-to-deal-with-vendor-prefixes/)
+
+* [Grid](https://css-tricks.com/snippets/css/complete-guide-grid/)
+
+* [Grid Layouts Examples](https://gridbyexample.com/examples/)
+
+* [CSS Grid Garden](https://cssgridgarden.com/)
+
+* [CSS Cheatsheet](https://cssauthor.com/html-and-css-cheat-sheets/#HTML)
+
+* [CSS Validator](http://jigsaw.w3.org/css-validator/);
+
+
+### Animations
+
+* [Animate CSS Library](https://animate.style/)
+
+* [Animatable CSS Library](https://projects.verou.me/animatable/)
+
+* [Web Effects CSS and Libraries](https://github.com/lindelof/awesome-web-effect)
+
+* [More CSS Animation Galleries](https://css-tricks.com/css-animation-libraries/)