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---
title: Styling a Widget
order: 8
layout: page
---
[[gwt.styling]]
= Styling a Widget
To make your widget look stylish, you need to style it. There are two basic ways
to define CSS styles for a component: in the widget sources and in a theme. A
default style should be defined in the widget sources, and different themes can
then modify the style.
[[gwt.styling.class]]
== Determining the CSS Class
The CSS class of a widget element is normally defined in the widget class and
set with [methodname]#setStyleName()#. A widget should set the styles for its
sub-elements as it desires.
For example, you could style a composite widget with an overall style and with
separate styles for the sub-widgets as follows:
[source, java]
----
public class MyPickerWidget extends ComplexPanel {
public static final String CLASSNAME = "mypicker";
private final TextBox textBox = new TextBox();
private final PushButton button = new PushButton("...");
public MyPickerWidget() {
setElement(Document.get().createDivElement());
setStylePrimaryName(CLASSNAME);
textBox.setStylePrimaryName(CLASSNAME + "-field");
button.setStylePrimaryName(CLASSNAME + "-button");
add(textBox, getElement());
add(button, getElement());
button.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
Window.alert("Calendar picker not yet supported!");
}
});
}
}
----
In addition, all Vaadin components get the [literal]#++v-widget++# class. If it
extends an existing Vaadin or GWT widget, it will inherit CSS classes from that
as well.
[[gwt.styling.default]]
== Default Stylesheet
A client-side module, which is normally a widget set, can include stylesheets.
They must be placed under the [filename]#public# folder under the folder of the
widget set, a described in
<<../clientside/clientside-module#clientside.module.stylesheet,"Specifying
a Stylesheet">>.
For example, you could style the widget described above as follows:
----
.mypicker {
white-space: nowrap;
}
.mypicker-button {
display: inline-block;
border: 1px solid black;
padding: 3px;
width: 15px;
text-align: center;
}
----
Notice that some size settings may require more complex handling and calculating
the sizes dynamically.
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