[Theme: Oragami Premium] Sidebar Menu Not Styled

For my site https://www.wsmc.net, I am using the Origami Premium theme, which does not come with a sidebar. In a child theme, I have created a page template for a specific section of my site (Math Olympiad) and have inserted a sidebar that I registered in my functions.php. In the sidebar I have added a menu widget. The items in the menu widget are not getting styled as you can see here:

https://www.wsmc.net/math-olympiad/

I previously had built out this section using the SiteOrigin Page Builder plugin to incorporate the sidebar, and you can see in this example of the same menu that it inherits the styles from the Origami theme:

https://www.wsmc.net/math-olympiad/history/

I can’t figure out what class I need to add to the div of my sidebar in my page template to make it match the rest of the theme. Any help would be greatly appreciated.