Changing menu color

this is my website

https://besthetique.co.il/

please see following screen shot.  i could not find the blue color to change inside themecss?   how can i change it?  i want to make it pink not blue

https://ibb.co/V9khJdD

I did marked with arrow

thanks.

Please go to wp-admin >> Appearance >> Customizing ▸ Header Bar Logo/Navigation

Styling

There you can change the styling of navigation let me know if you face any problem or need further assistance. Thanks