Update animate-images-with-keyframes-using-css.mdx

Author: asiqurrahman

projects/animate-images-with-keyframes-using-css/animate-images-with-keyframes-using-css.mdx

@@ -61,3 +61,15 @@ Now, for something new: we can add some fun animations like _this_:
 <RoundedImage link="https://i.imgur.com/iqNCiye.gif" description="tedxcmu" />
 
 and _this_: 
+
+<RoundedImage link="https://i.imgur.com/oYGbPkH.gif" description="html review" />
+
+using CSS `@keyframes` !! (We'll explain more soon...) And the best part- we don't have to use JavaScript for it! 
+
+## What are animations in CSS
+
+Before we get started, it's important to note what animations are in CSS. Animations are made up of a series of frames, or in this case, HTML elements that change over time. 
+
+<RoundedImage link="https://i.imgur.com/oYGbPkH.gif" description="html review" />
+
+### keyframes