Why doesn't setting the styles of Labels work?

[lavcom.ru]

I want to change the font size and weight in a label. I did find this on Stack Overflow:StackOverflow articleHowever it doesn't seem to fully answer the question OR there is something I am not getting.Consider the following code:\[code\]package com.mycompany.project.client;import com.google.gwt.core.client.EntryPoint;import com.google.gwt.user.client.ui.HTML;import com.google.gwt.user.client.ui.RootPanel;import com.google.gwt.user.client.ui.Label;/** * Entry point classes define <code>onModuleLoad()</code>. */public class StyleTest implements EntryPoint{ private final Label lblATestLabel = new Label( "A Test Label" ); public void onModuleLoad() { RootPanel rootPanel = RootPanel.get(); lblATestLabel.setStyleName( "gwt-Label.TestStyle" ); rootPanel.add( lblATestLabel, 204, 187 ); lblATestLabel.setSize( "73px", "32px" ); HTML hlabel = new HTML(); hlabel.setStyleName("gwt-Label.TestStyle"); hlabel.setHTML("Brown <span class=\"brown\">fox</span>"); rootPanel.add(hlabel, 42, 36); hlabel.setSize("335px", "41px"); }}\[/code\]And this style at the bottom of StyleTest.css:\[code\].gwt-Label.TestStyle { color: Green; vertical-align: middle;}\[/code\]My expectation is that my text will be centered vertically and be green. The result is no change at all. I can set any styles I want and there is no change to either the Label or HTML label. It all looks normal, what am I doing wrong?