from textual.app import App, ComposeResult
from textual.widgets import Label, TabbedContent, TabPane


class TabApp(App):
    CSS = """
    TabPane {
    border: solid blue;
    }
    """

    def compose(self) -> ComposeResult:
        with TabbedContent():
            with TabPane("Tab 1", id="tab-1"):
                yield Label("hello")
                yield Label("hello")
                yield Label("hello")
            with TabPane("Tab 2", id="tab-2"):
                yield Label("world")


if __name__ == "__main__":
    app = TabApp()
    app.run()