Tkinter ttk update label style

I am trying to update the of the background color of a text label. For this I am using the ttk module of tkinter.

For some reason it doesn't want to execute the config.xx(style="xx.TLabel.

from tkinter import *
from tkinter import ttk

win = Tk()
win.geometry("1200x800") #1024*600
s = ttk.Style(win)

s.configure("CustomGrey.TLabel",   background="#4D4D4D", foreground="white")
s.configure("CustomGreen.TLabel",  background="#97D077", foreground="white")
s.configure("CustomYellow.TLabel", background="#FFD966", foreground="white")
s.configure("CustomRed.TLabel",    background="#FF6666", foreground="white")


s.configure("CustomRed.TLabel", background="#FF6666", foreground="white", font=('Time New Roman', 60), anchor= "c")


def updateLabelColor(color):
    if   color == "Green":  battery_lab.config(style="CustomGreen.TLabel")
    elif color == "Yellow": battery_lab.config(style="CustomYellow.TLabel")
    elif color == "Red":    battery_lab.config(style="CustomRed.TLabel")
 
updateLabelColor("Green")

The goal is that text can change color in a program. It does not matter if it is done via a tk or a ttk label.

Does anyone know what to do with this?

I'm not sure what you asked for. If you want to change a tkinter.Label's background color you can easily change it by adding background attribute:

from tkinter import *
root = Tk()
label = Label(root, text="A Text", background="yellow")
label.pack(pady=30, padx=50)
root.mainloop()

If you want to change a tkinter.Label's color by pressing a button or getting an input you can do this:

from tkinter import *

root = Tk()

def update_Label_color(color):
    if color == "Green":
        label.config(background="green")
    elif color == "Yellow":
        label.config(background="yellow")
    elif color == "Red":
        label.config(background="red")

color_variable = StringVar(value="Green")
input = Entry(root, bg="orange", textvariable=color_variable)
input.pack(pady=10, padx=50)
button = Button(root, width=30, height=5, text="Button", command= lambda: update_Label_color(color_variable.get()))
button.pack(pady=30, padx=50)
label = Label(root, text="A Text", background="white")
label.pack(pady=30, padx=50)

root.mainloop()