.header .menu-wrapper li > a:hover,
.fixed-header .menu-wrapper li > a:hover{
opacity:.6;
}
.header .menu-wrapper li.current-menu-item > a,
.fixed-header li.current-menu-item > a{
opacity:.6;
}
Current styles for bg and font are the default and come from dark.css.
This http://prntscr.com/ln6ja5 can be changed via Theme Options > Menu > Menu styling > Dropdown options > Dropdown background.
To change this http://prntscr.com/ln6jys go to Theme Options > Typography > Menu > Menu 2 level > Font Color.
