HELP! Background/hover colours changes

Help would be much appreicated!

I am trying to double up the menu http://prntscr.com/pdcial

https://www.wildedge.co.uk/ (green section archery taster, wild camps etc…

But I cannot seem to keep the menu the same height or change the colour. I am editting the site but struggling with how it has been built! I assume I can do this with some coding??