I have been working on this problem for several hours.
I have read the 2 pages of scrollspy several times and posts in the forum .The problem is not solved.
My codepen of personal portfolio: https://codepen.io/yingjiehu/pen/jajwGd
- The menu is not highlighted when the page is scrolled down.
- When the width of the page is small, the menu becomes a list. But I click the button of the list, the list does not appear.