How to change width of splitpanel?

Hi,
I’m trying to change :
//css


.splitpanel .v-splitpanel-vsplitter-locked, .v-splitpanel-vsplitter{
		width: 0px;
    	        border: 0px;
		background: transparent;
	}

//JAVA


split.setStyleName("splitpanel");

but nothing happen. Please help.

I do it this way:

.v-splitpanel-hsplitter, .v-splitpanel-hsplitter-locked
    {width: 3px; background-image: none;}
.v-splitpanel-hsplitter div
    {background: none; width: 3px;}
.v-splitpanel-vsplitter, .v-splitpanel-vsplitter-locked
    {background-image: none; height: 3px;}
.v-splitpanel-vsplitter div
    {background: none; height: 3px;}