How to set CSS to treeview Control of asp.net

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ASP.NET

I have call Images stored in DataBase using ashx handler i am not able to apply CSS to adjust width and height to Imgs

<asp:TreeView ID="TreeView1" runat="server" ImageSet="Arrows">
                    <NodeStyle CssClass="TreeImg" />
                      <ParentNodeStyle Font-Bold="False" CssClass="TreeImg"/>
                      <HoverNodeStyle Font-Underline="True" ForeColor="#5555DD" CssClass="TreeImg"/>
                      <SelectedNodeStyle Font-Underline="True" HorizontalPadding="0px" VerticalPadding="0px"
                          ForeColor="#5555DD" CssClass="TreeImg"/>
                      <NodeStyle Font-Names="Tahoma" Font-Size="10pt" ForeColor="Black" HorizontalPadding="5px"
                          NodeSpacing="0px" VerticalPadding="0px" />
                  </asp:TreeView>

CSS TreeImg not getting apply

headnode.ImageUrl = "TreeImg.ashx?id=" + Parent.Tables[0].Rows[0]["MCID"].ToString();// to call ashx handler byte to get img