Add main app, adjust styles

from textual.app import App, ComposeResult

from textual.containers import VerticalScroll

from textual.widgets import Footer, Header

from poolpay.admin.AddPerson import AddPerson

from poolpay.admin.PersonsTable import PersonsTable

class PoolPayAdminApp(App):

    CSS_PATH = "resources/main.tcss"

    BINDINGS = [

        ("n", "add_person", "Neue Person hinzufügen"),

        ("d", "toggle_dark", "Dark Mode umschalten"),

    ]

    def compose(self) -> ComposeResult:

        yield Header(show_clock=True)

        yield VerticalScroll(PersonsTable())

        yield Footer()

    def on_mount(self) -> None:

        self.title = "PoolPay"

        self.sub_title = "Administration"

    def action_add_person(self) -> None:

        self.push_screen(AddPerson())

Main {

    margin: 1 2;

}

Button {

    width: 25;

}

#persons {

    margin-top: 1;

PersonsTable {

    margin-top: 3;

    margin: 1 2;

}

AddPerson {