thinner border split HorizontalSplitPanel

In the sampler the border of the split (mainSplit HorizontalSplitPanel) is very thin. Nevertheless in the example SplitPanelBasic http://demo.vaadin.com/sampler#SplitPanelBasic the border of the split are wider, as in default. I would like to know how I can set the border of split thinner like the sampler.

See http://demo.vaadin.com/ReindeerTheme for all the options.

You need to do a setStyleName(Reindeer.SPLITPANEL_SMALL)