.inside-right-sidebar ul li {
text-align: center;
padding-top: 6px;
padding-bottom: 6px;
background-color: #0c0c0d; /* this is setting the background color */
margin-top: 3px;
margin-bottom: 3px
}
I can’t see where it’s coming from, if you don’t recognise it then flush autoptimize cahce and disable it and i can take another look.