/* Change separator color */
#adminmenu li.wp-menu-separator.realtyna-base-plugin {
    border-top: 3px solid #48358e !important; /* Example color */
    background-color: #48358e !important; /* Example color */
    margin-bottom: 0px;
}

/* Change MLS On The Fly<sup>&reg;</sup> menu background for all IDs containing "toplevel_page_mls-on-the-fly" */
[id*="toplevel_page_mls-on-the-fly"] .wp-menu-name,
[id*="toplevel_page_mls-on-the-fly"] .wp-submenu {
    background-color: #644BC4 !important; /* Example color */
    color: #ffffff !important;
}