Maybe this will be a controversial experiment, because plagiarism the other sites are strictly prohibited. That's a violation of copyright. Therefore, I'm not going to make this experiment as a work that can be downloaded. I hope you can understand about that, because I really appreciate of copyright.
I was originally wanted to implement an accordion effect on the sidebar, but after I tried it was so hard, so for now this is how it is. No accordion. Only a bit loading effect:
Here's the original: jsfiddle.net