How to change the highlight colour for Inbox

Hi, I have installed J&E plugin and activated the messaging plugin.

However, the Inbox button on the Jobs & Expert Page is highlighting in a different colour compared to the other buttons like "Browse Jobs", "Browse Experts", "Post a job" etc.

Is there any way I can change the highlight colour for the Inbox button to be the same as the rest of the buttons? Thanks in advance for any advice!