Step 1:
Navigate to WordPress Admin Dashboard > Appearance > Customize > Hostiko Customizer > Navbar Style > color.

Step 2:
Search for Hover Color and change the Hover color.

Step 3:
Search for Active Color and change the Active Color.

Step 4:
Search for Dropdown Background Color and change the Dropdown Background Color.

Step 5:
Search for Dropdown Border Color and change the Dropdown Border Color.

Step 6:
Search for Dropdown Hover background and change the Dropdown Hover Background.

Step 7:
Click on Publish once you are done with all of changes.