I cant change color of menu using starter template

Hi there. I imported starter template called “Outdoor Adventure” and I am using Astra theme. Beside imported pages, I created a few more because I need it.
I want that background of hover is light blue as it is on the first page, on the background image that I posted, but it gives me white color of dropdown menu with light blue hover. I don’t understand why white color of dropdown menu is shown. I just want a background image that I posted with light blue hover background.
Thanks in advance.

The page I need help with: [log in to see the link]