Jquery UI css doesnt work : I've just watched a youtube video about Jquery UI and here is the link:
https://www.youtube.com/watch?v=WrHpzNMlhfo

and so i saw that we can try it also with this link:
http:// jsbin.com/chromebug/4

but the result turn me crazy, I really dont have any idea about it
[enter image description here][1]


  [1]: https://i.stack.imgur.com/OXlKz.jpg


and my chrome version is 57.0.2987.133