How do I light up my navigation elements when using scrollspy in bootstrap?

How do I light up my navigation elements when using scrollspy in bootstrap?
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#1

I’m having trouble figuring this out. Here’s my codepen https://codepen.io/Wofford300/pen/PpLqYe


#2

What does “light up [your] navigation elements” mean? It seems like your nav buttons already correctly reflect the section I scroll to.


#3

I solved the problem with the help of someone from Gitter.