Comment 2 for bug 1024334

Lightread uses GTK and Webkit to render the UI. Scrollbars are simply styled via the webkit scrollbar definitions. So, in order to support overlay-scrollbars (which in my opinion might not suite so well to the left side scroll bar), they could either:
a) Use 2 different gtkscrollwindows and use different webkitview widgets in them (and not setting overflow-y in css.
b) Use html/css emulation of the overlay scrollbars