It's a bit of HTML coding magic!
And it's not very easy either; really meticulous. However if you look up some tutorials, you may be able to get the coding for it! I had to do some digging in order to get the right codes, and even then you gotta be careful and pay close attention to detail. Code is easy to break. XD
I didn't code this page, so how the other admins acquired it is not within my knowledge. ouo/