I am trying to code a responsive menu.
this is my code link:https://codepen.io/sarah870102/pen/aEoNaa
the page is divided into three sections: ABOUT, PORTFOLIO and CONTACT.
the menu on the right-top of the page is linked to the different sections.
I want to realize the function that the menu linked to someone page section shown in the monitor will highlight when a user is scrolling the mouse.
I have no idea how to achieve the function by Bootstrap.Please give me some help. Thanks a lot!