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.