actions docs

docs/examples/guide/actions/actions03.py

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+from textual.app import App, ComposeResult
+from textual.widgets import Static
+
+TEXT = """
+[b]Set your background[/b]
+[@click=set_background('red')]Red[/]
+[@click=set_background('green')]Green[/]
+[@click=set_background('blue')]Blue[/]
+"""
+
+
+class ActionsApp(App):
+    def compose(self) -> ComposeResult:
+        yield Static(TEXT)
+
+    def action_set_background(self, color: str) -> None:
+        self.screen.styles.background = color
+        self.bell()
+
+
+if __name__ == "__main__":
+    app = ActionsApp()
+    app.run()