Customize mega menu on Drupal 8 website - minor customizations

I have 3 tasks that I need completed soon. I have mega menu set up on my drupal 8 website. The links have already been inserted with correct hierarchy, but I need further customization to function and style. See this page to view current state of side menu: [login to view URL] Here are the tasks: 1. Make the orange arrow in the side navigation a toggle for sub links. When the arrow is clicked, it will show the sub links without refreshing page. 2. Make the sub links of sub links appear like the above example (see attachment), they should be able to be toggled as well. 3. Example page: [login to view URL] 
Make it so that whatever page you are on, it is shown bolded in the side menu. In the link above, College Credit in Highschool should be bolded in the side menu. Project goes to whoever can deliver the quickest Please see attachment for image example.