display is not fixed when debugging in browser

[bobwatcherx]

I run flet in a browser, why doesn't it look neat when it's in Firefox. when on the desktop it looks as cool as it is and in the browser it doesn't

BROWSER

code

from flet import *


class User(UserControl):
    def __init__(self,page):
        super(User, self).__init__()
        self.data = Column()
        self.width = page.window_width

    def build(self):
        return Column([
            Text("123"),
            self.data,
            Text(self.width),
            ElevatedButton("send",
            on_click=self.sendmsg
                )

            ])
    def on_message(self,msg):
        self.data.controls.append(
            Column([Text(msg)])
            )
        self.update()

    def sendmsg(self,e):
        self.page.pubsub.send_all("Tolol")
        self.update()

    def did_mount(self):
        self.page.pubsub.subscribe(self.on_message)






def main(page:Page):
    user = User(page)
    page.add(Column([user]))

flet.app(target=main,view=WEB_BROWSER)