Cannot find jquery-ui.css file after install

Cannot find jquery-ui.css file after install

Hi, I'm going through simple tutorial on tabs using the link: Collapsible example.  I am using it in Asp.Net MVC application.  I've installed jquery-ui.combined through Nuget.  In the above example it uses jquery-ui.css file, but I cannot find anywhere within my solution.  I believe as a result my Tabs do not function properly.

Also, in that example it uses jquery-1.12.4.js, but the most recent version available from the Nuget packages is 1.11.4.

Can anyone hint on what do i need to do?