How to expand ttk notebook label or tab button to fill window

I want to expand label to fill window

For example we use in tk button

parent.columnconfigure(0, weight=1)

button.grid(sticky='ew')

Can we do something like this to expand both label name to capture all available screen

And my second question : How to change background color or all available settings for that label or button tab

Thanks in advance

import tkinter as tk
from tkinter import ttk

root = tk.Tk()
root.geometry('600x400+0+0')
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)

tabs = ttk.Notebook()
tabs.grid(row=0, column=0, sticky='nsew')

tab1 = tk.Frame(tabs, bg='red')
tab2 = tk.Frame(tabs, bg='green')

tabs.add(tab1, text='First Tab')
tabs.add(tab2, text='Second Tab')

root.mainloop()

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