I know that is a more individual theme customization question. But maybe you or someone here had that before, I would like to change the background color of the mobile menu open for the black walnut theme to fit the color more in. I already changed the background color for the „burger“:
#mobilenav-close {
background: #2c2971;

that worked perfect, as far as I could see this here has to be changed for the background of the open mobile menu?:
#site-nav {
display: none;
background: #222;
width: 290px;
margin: 0 15px;
padding: 45px 0 12px;
border-bottom: 1px solid rgba(0, 0, 0, 0.15);
position: absolute;
right: 0;
z-index: 100000;
text-align: center;

for some reason, as soon as I change the color in the child theme the menu appears sticky in the right corner also in the not mobile version. Any Idea?
All the best and thank you in advance,