CSS menu (open cube)

I’m relatively new to WP. About 2 years ago I purchased a site license for Quick Menus from opencube.com and I’m very happy with it.

I’d like to have WP menus work the Quick Menus drop downs. What I need seems pretty simple, here it is:

This line in my theme:

<?php wp_list_pages('sort_column=menu_order&title_li='); ?>

Sends this to the browser:

<li class="page_item page-item-2"><a href="https://culinarytraveler.com/about/" title="About">About</a></li>
<li class="page_item page-item-7 current_page_item"><a href="https://culinarytraveler.com/portfolio/" title="Portfolio">Portfolio</a></li>
  <ul>
   <a href="https://culinarytraveler.com/portfolio-child/" title="Portfolio">Portfolio Child</a></li>
   </ul>
<li class="page_item page-item-19"><a href="https://culinarytraveler.com/contact/" title="Contact">Contact</a></li>

But I need the list to be output as <div>:

<div style="width:220px;">
<a href="https://culinarytraveler.com/about/" title="About">About</a>
<a href="https://culinarytraveler.com/portfolio/" title="Portfolio">Portfolio</a>
  <div style="width:200px;">
   <a href="https://culinarytraveler.com/portfolio-child/" title="Portfolio">Portfolio Child</a>
  </div>
<a href="https://culinarytraveler.com/contact/" title="Contact">Contact</a>
</div>

Where would I begin to look for this formatting? Is it different with each theme or is this WP coding?

thanks,
Tim

P.S. this is the first time I tried to enter code in this forum, if it doesn’t show right I’ll post this again.