Copy buttons example into sandbox

sandbox/darren/buttons.py

@@ -0,0 +1,31 @@
+from textual import layout, events
+from textual.app import App, ComposeResult
+from textual.widgets import Button
+
+
+class ButtonsApp(App[str]):
+    def compose(self) -> ComposeResult:
+        yield layout.Vertical(
+            Button("default", id="foo"),
+            Button.success("success", id="bar"),
+            Button.warning("warning", id="baz"),
+            Button.error("error", id="baz"),
+        )
+
+    def handle_pressed(self, event: Button.Pressed) -> None:
+        self.app.bell()
+
+    async def on_key(self, event: events.Key) -> None:
+        await self.dispatch_key(event)
+
+    def key_d(self):
+        self.dark = not self.dark
+
+
+app = ButtonsApp(
+    log_path="textual.log", css_path="buttons.css", watch_css=True, log_verbosity=2
+)
+
+if __name__ == "__main__":
+    result = app.run()
+    print(repr(result))