How do I remove the background color within my navigation bar dropdown?

Hi there,

I'm looking to remove the dark green background on my navigation bar for the "Photography" dropdown section. I'd like it to be transparent. Thanks for the help! 

https://www.nicoleschmiedl.com/

Hello. Are you open to recommendation regarding your store

You can add this code to Website > Website Tools (under Not Linked) > Custom CSS

div.header-nav-folder-content {
    background-color: transparent !important;
}