java - How can I change the color of buttons? -

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i'm developing first application in vaadin , can't change color of button (want them blacks). i'm using custom theme inherited reindeer.

i try in way:

    buttonsetting = new button();     buttonsetting.seticon(new themeresource("images/icons/16px/setting.png"));     buttonsetting.addstylename(reindeer.button_small);     buttonsetting.addstylename(reindeer.layout_black);

but doesn't work, how can do?

as far can see reindeer.layout_black should style name of component containing button. 

public class adminbar extends customcomponent {  private final horizontallayout layout = new horizontallayout();  public adminbar(lang lang) {     setcompositionroot(layout);     setwidth(100, unit.percentage);     layout.setwidth(100, unit.percentage);     setstylename(reindeer.layout_black);     button button = new button("i'm button");     button.setstylename(reindeer.button_small);     layout.addcomponent(button); } }

if set style name of horizontallayout instead of adminbar, whole layout black.


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