Topic on Skin talk:Vector

I noticed that the Vector legacy skin in zh.wikipedia.org have a differecen look compare with en.wikipedia.org.

The zh.wikipedia.org have two features which are interestining :1 the blue < button to hide the left side bar menu , 2. the blue up and down arrow to navigate to top and bottom of the pages.

How to appply this into the personal wiki Vector legacy skin ?

The collapsible sidebar is implemented using zh:MediaWiki:Gadget-CollapsibleSidebar.js and the blue arrows through zh:MediaWiki:Gadget-scrollUpButton.js.