Change the color of the template available in Nopcommerce

I have a pink colored theme on Nopcommerce.
I want to change the color of this theme to black.
How can I change them all at once instead of changing them one by one?

I think you need to change the Main CSS
styles.css

check the color of the background and replace it with new Color
same as the Font color

but you need to manage according to your needed