vaadin-framework/themes/src/main/themes/VAADIN/themes/liferay/splitpanel/splitpanel.scss

@mixin liferay-splitpanel {

.v-splitpanel-hsplitter, 
.v-splitpanel-hsplitter-locked {
	font-size: 1px;
	width: 3px;
	background-color: #c8c9ca;
}

.v-splitpanel-hsplitter div {
	font-size: 1px;
	width: 3px;
	background: transparent;
	background-repeat: no-repeat;
  	background-image: url(hsplit.png);
  	background-position: center;
}

.v-splitpanel-hsplitter-locked div {
	font-size: 1px;
	width: 3px;
}

.v-splitpanel-vsplitter,
.v-splitpanel-vsplitter-locked {
	font-size: 1px;
	height: 3px;
}

.v-splitpanel-vsplitter div {
	font-size: 1px;
	height: 3px;
	background: transparent;
	background-color: #c8c9ca;
	background-repeat: no-repeat;
  	background-image: url(vsplit.png);
  	background-position: center;
}

.v-splitpanel-vsplitter-locked,
.v-splitpanel-vsplitter-locked div {
	font-size: 1px;
	height: 3px;
	background-color: #c8c9ca;
}

/* Small SplitPanel */

.v-splitpanel-hsplitter-small,
.v-splitpanel-hsplitter-small div,
.v-splitpanel-hsplitter-small-locked,
.v-splitpanel-hsplitter-small-locked div {
	font-size: 1px;
	width: 1px;
	background: #c8c9ca;
}

.v-splitpanel-vsplitter-small,
.v-splitpanel-vsplitter-small div,
.v-splitpanel-vsplitter-small-locked,
.v-splitpanel-vsplitter-small-locked div {
	font-size: 1px;
	height: 1px;
	background: #c8c9ca;
}

}