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Make Nav Bar Links Change Colour When visit a Section

Hello, I know the Nav Bar Links change colour when you visit the relevant page. My client would like this to happen on two Nav Bar links which go to a different area on the home page, then return to the original colour when you leave that section. I am sure it can be done with interactions but I just can’t get my head around it (I don’t have a lot of experience with Interactions). The Nav Links are About and Services. Can any one point me to a tutorial that might help? Many thanks

Here is my public share link:

(how to access public share link)

Can anyone help with this please?