I got this from Tuan for this site: https://harmonica-koala-67z4.squarespace.com/iv-floor-stand-1
I didn’t need transparancy but was able to left justify the text and each drop down box adjusts it’s size to the size of the nav group it’s under.
In Design>CSS put:
/* Change dropdown menu background & link color 🙂 */
.header-nav-folder-content {
background: hsl(202, 73%, 91%) !important;
color: #000000 !important;
}
a {
color: #000000;
}
/* Expand Dropdown Item */
.header-nav .header-nav-item--folder .header-nav-folder-content {