Update index.html add a new link Animated 3D cube

Author: lenadgit

index.html

@@ -58,5 +58,6 @@ <h2>CSS Animation</h2>
 <a href = "/animatedlink">Animated link</a><br>
 <a href = "/animatedheader">Animated header</a><br>
 <a href = "/animatedheadings">Animated headings</a><br>
+<a href = "/animated3dcube">Animated 3D Cube</a><br>
 <!--<a href = "/greencityclient">GreenCity</a><br>  -->
 <!--<img src = "http://i.piccy.info/i9/6526a57259318d789d809362790670eb/1473879596/27609/1070131/github_mark.png" style = "float:right; width: 30%;">-->