Edit Dropdown Menu // Different Colors for Different Pages

Hey there! I've customized the code for the dropdown menu on my site, however, I need to customize further on two pages where the color theme is different. The homepage along with a majority of other pages are a lighter theme, while the "Duck River Cleanup" and "Great American Cleanup" pages are a darker theme. The background on the dropdown menu for those pages is dark blue and I would like to change it to white.

URL: www.keepmaurybeautiful.com
Password: Password

Thanks!

You can add CSS to target individual pages with the page collection ID or by targeting the section color theme.

https://squarefortytwo.com/squarespace-guides/find-an-id-in-squarespace-71

So, I've used the Block ID finder before to target certain areas with code but I lack the skills in knowing the exact code I would need to insert here? I'm only trying to change the background color of the dropdown menu to white when navigating while on the "Duck River Cleanup" and "Great American Cleanup" pages. 

Try this Custom CSS:

#collection-64ee49e1f9b13875e5f070f8, #collection-64ee503aa474770dca11ac8d {
  .header-nav-folder-content {
    background-color: #fff;
  }
}