[razortw]

Try this. You may want to change the actual colors though.

.navbar-inverse {
  background-color: #f00;
  border-color: #f00;
}
#top-main-menu > li:hover > a,
.navbar-inverse .navbar-nav > li > a:hover,
.navbar-inverse .navbar-nav > li > a:focus,
.navbar-inverse .navbar-nav > .active > a,
.navbar-inverse .navbar-nav > .active > a:focus,
.navbar-inverse .navbar-nav > .active > a:hover {
  background-color: #d00 !important;
}