You can change the color of your menu based on your corporate color.
1. Login to Wp-admin, at the Dashboard, bottom left you will find "Theme Options", click on "Main Menu Settings"
2. You will find the "Dropdown menu background color" and "Border color and Dropdown menu background hover color".
Dropdown menu background color - Lighter color, the background color of the dropdown menu.
Border color and Dropdown menu background hover color - Darker color, when mouse hover and is selecting on the specific menu, it will show a darker color indicating the selection.
TIPS: "Dropdown menu background color" & "Border color and Dropdown menu background hover color" should be the same color but different color tone (E.g. Red & Maroon / Light Blue & Dark Blue).