How to remove Dropdown background on One Page

To remove Dropdown background on One Page, you can follow these
#1. Use tool to find Page ID
In my example, we will have: #collection-6673f2e18432c25013aee99f

#2. Use CSS code like this to Custom CSS box

#collection-6673f2e18432c25013aee99f div.header-nav-folder-content {
    background-color: transparent !important;
}