How to change scroll Bar Style

How to change scroll Bar Style

I like to know how to add a custom scroll bar to a table (item table). I
have written the code below. Once 10 items are added the scroll bar
appears,but i like a custom scroll pane to appear (eg: a scroll like in
fb).
.carttable{margin:2px;width:252px;height: 200px;overflow: auto;}