Highlight Menu item in WordPress

Hello there!
I’ve spent a lot of time trying to figure this out and for the life of me just can’t do it. I hope you can help!
I have a menu with many type of links
Home (Custom)
Live healthy (Category)
Posts (Category)
Advise (Custom)
Videos (Custom)
Contact (Custom)
The problem is when i click on Category-type menu item, it doesnt highlight as current page (Custom is ok). I try seaching everywhere for solution but no result. If anyone can tell me what I might need to do, it would be much appreciated.
My site is here
Thank you in advance! (Im sorry for my poor English)