Different colors on the dropdown for different pages?

Hi there! I'm working on a site where some of the pages have a blue/positive header menu and some of the pages have the menu in white/negative. This is all good, but it causes problems with the folder dropdown menu and the readability (see attached dumps). My question: can I set different background colors on the dropdown for different pages?

I solved this by adding css in the header of the specific pages:

<style>
.header-nav-folder-content {
    background: rgba(255,255,255,0.9)!important;
}    

It should have close style tag

<style>
.header-nav-folder-content {
    background: rgba(255,255,255,0.9)!important;
}    
</style>