The font colours deoend on native state .v. rollover .v. active but the but
to get the bar black:
.menu-block {
background-color: #000;
min-height: 60px;
}
the left/right borders
.ow-navigation .navbar-nav > li > a {
border-left: 1px solid #42c754;
border-right: 1px solid #42c754;
font-weight: bold;
padding: 0 25px;
}
You will need to edit this CSS. Go in the admin to Appearance > Customise > look for CSS on the left and paste the two code snippets above.
NOTE: AS LONG AS YOU USE CUSTOMISER AND DON’T EDIT THE STYLESHEET THIS SHOULDNT RISK ANY ISSUES BUT I HAVE NOT SEEN YOUR ADMIN OR BEHIND THE SCENES OF THE WEBSITE SO CANNOT MAKE ANY GUARANTEE