vaadin-framework/src/com/itmill/toolkit/terminal/gwt/public/default/splitpanel/splitpanel.css

.i-splitpanel-horizontal .hsplitter {
	width: 8px;
	background: #ccd2d0 url(img/bg_hor.png);
	border: 1px solid #b6bbbc;
	cursor: e-resize;
}

.i-splitpanel-vertical .vsplitter {
	height: 8px;
	background: #ccd2d0 url(img/bg_ver.png);
	border: 1px solid #b6bbbc;
	cursor: n-resize;
}