Although it works fine with TableView, it does not work for the WebView.
Adjusting padding and font size only increases the height of scroll-bars increment/decrement buttons but the width remains default.
The core problem is that I have a touch-screen driver with insufficient support for JavaFX TouchEvents (no SWIPE, SCROLL etc). It means that I received only mouse pressed/released and mouse move events. For that reason, I need to make my GUI (WebView, TableView,..) more user friendly.