I am working on a Flet app and have built a custom control with some animations. The problem I am encountering is that when I first run the app, the control's color initially appears as a deep blue before changing to the color it is supposed to be. I suspect this color transition, from blue to the intended color, is due to the animation I applied to the container. However, I don't understand why it starts as blue in the first place.

I tried using different themes for the app and I believe that the initial blue color is the primary color from the default dark theme that comes with Flet.

import flet


class TableroEmpresa(flet.Container):
    def __init__(self):
        self._row_iconos = flet.Row(
            controls=[
                self.icono_tablero(
                    icon=flet.Icons.BLOCK,
                    tooltip="Dar de baja",
                ),
                self.icono_tablero(
                    icon=flet.Icons.DONE_OUTLINE_ROUNDED,
                    tooltip="Dar de alta",
                ),
                self.icono_tablero(
                    icon=flet.Icons.EDIT_SQUARE,
                    tooltip="Editar",
                ),
            ],
            alignment=flet.MainAxisAlignment.CENTER
        )
        self._container_animado = flet.Container(
            width=280,
            height=380,
            bgcolor=flet.Colors.PRIMARY_CONTAINER,
            border_radius=12,
            animate=flet.animation.Animation(duration=600, curve=flet.AnimationCurve.EASE),
            border=flet.border.all(2, flet.Colors.PRIMARY_CONTAINER),
            content=flet.Column(
                offset=flet.Offset(0,0),
                animate_offset=flet.animation.Animation(300, flet.AnimationCurve.EASE),
                alignment=flet.MainAxisAlignment.CENTER,
                horizontal_alignment=flet.CrossAxisAlignment.CENTER,
                spacing=0,
                controls=[
                    flet.Container(
                        padding=20,
                        alignment=flet.alignment.bottom_center,
                        content=flet.Text(
                            value="Nombre empresa",
                            text_align=flet.TextAlign.CENTER,
                            color=flet.Colors.ON_PRIMARY_CONTAINER,
                            size=26,
                            weight=flet.FontWeight.W_800,
                        )
                    ),
                    flet.Container(
                        margin=flet.Margin(top=0, left=20, right=20, bottom=20),
                        width=80,
                        border_radius=3,
                        alignment=flet.alignment.bottom_center,
                        bgcolor=flet.Colors.SECONDARY,
                        content=flet.Text(
                            value="Activa",
                            color=flet.Colors.ON_SECONDARY,
                            size=14,
                            weight=flet.FontWeight.W_800,
                        )
                    ),
                    flet.Text(
                        value=f"Total empleados: {17}\n"
                              f"Empleados activos: {13}",
                        text_align=flet.TextAlign.CENTER,
                        weight=flet.FontWeight.W_500,
                        color=flet.Colors.ON_PRIMARY_CONTAINER
                    )
                ]
            )
        )
        self._card = flet.Card(
            elevation=0,
            content=self._container_animado
        )
        super().__init__(
            on_hover=self.animar_card,
            content=flet.Stack(
                width=320,
                height=440,
                alignment=flet.alignment.top_center,
                controls=[
                    self._card,
                    flet.Container(
                        bottom=40,
                        content=self._row_iconos
                    )
                ]
            )
        )

    def icono_tablero(self, icon, tooltip, on_click=None):
        return flet.IconButton(
            visible=False,
            animate_opacity=200,
            offset=flet.transform.Offset(0, 0.75),
            animate_offset=flet.animation.Animation(duration=200, curve=flet.AnimationCurve.EASE),
            bgcolor=flet.Colors.PRIMARY,
            icon=icon,
            icon_color=flet.Colors.ON_PRIMARY,
            icon_size=30,
            on_click=on_click,
            tooltip=tooltip,
        )

    def animar_card(self, e):
        for icono in self._row_iconos.controls:
            icono.visible = True
        self._row_iconos.update()

        if e.data == "true":
            # Animación de elevación de la card
            for _ in range(20):
                self._card.elevation += 1
                self._card.update()

            # Animación del borde de la card
            self._container_animado.border = flet.border.all(4)
            self._container_animado.content.offset = flet.transform.Offset(0, -0.02)
            self._container_animado.update()

            # Animación de la posición del botón
            for icono in self._row_iconos.controls:
                icono.offset = flet.transform.Offset(0, 0)
                icono.opacity = 1
                icono.update()

        else:
            # Animación de elevación de la card
            for _ in range(20):
                self._card.elevation -= 1
                self._card.update()

            # Animación del borde de la card
            self._container_animado.border = None
            self._container_animado.content.offset = flet.transform.Offset(0, 0)
            self._container_animado.update()

            # Animación de la posición del botón
            for icono in self._row_iconos.controls:
                icono.offset = flet.transform.Offset(0, 0.75)
                icono.opacity = 0
                icono.update()


def main(page: flet.Page):
    def change_theme(e):
        if page.theme_mode == "light":
            page.theme_mode = "dark" 
            page.controls[1].icon = flet.Icons.LIGHT_MODE
        else:
            page.theme_mode = "light" 
            page.controls[1].icon = flet.Icons.DARK_MODE
        page.update()

    page.theme = flet.Theme(color_scheme_seed=flet.Colors.DEEP_PURPLE)
    page.add(
        TableroEmpresa(),
        flet.IconButton(
            icon=flet.Icons.LIGHT_MODE,
            on_click=change_theme
        )
    )


flet.app(main)