Customize menu

Hi cedeka,

Put below CSS rules into Custom CSS Editor:

/* Border bottom */
.navbar-default .navbar-nav li a:after {
    background-color: #3c7376;
}
/* menu text hover color */
.navbar-default .navbar-nav li:hover a {
    color: #3c7376;
  	border-color: #3c7376;
}
.navbar-default .navbar-nav li a.active {
	color: #fff;
  	background-color: black;
 	border-color: #3c7376;
}
/* menu text color */
.navbar-default .navbar-nav li a {
    color: #000;
}
/* menu background color */
.navbar-default .navbar-nav li {
    background-color: #7fffd4;
}
.navbar-default .navbar-nav li a.active:hover {
    background-color: #7fffd4;
  	color: #000;
}

Save the changes.

Note: Here you can change Hex color code according your need.

Thank You