how can I change the folder dropdown background color

Site URL: https://www.soulandfineart.com

SS=7.1 fluid

pw: Art-is-Joyful

how can i change the background color of the entire dropdown when the mouse hovers over a folder in my top nav? 

In case it matters I am using the following in css

/* stop folders in nav from being clickable */
a.header-nav-folder-title {
    pointer-events: none;
}
/* end stop folder click */

/* start add color change to folder items on hover */
.header-nav-folder-item:hover {
  background: #C3C3C3;
}

/* END add color change to folder items on hover */

Add to Design > Custom CSS

/* Nav dropdown */
.header-nav-folder-content {
    background-color: #f1f !important;
}