justified-nav

css

// hightlight actived menu item
.nav-justified > .active > a,
.nav-justified > .active > a:hover,
.nav-justified > .active > a:focus {
  background-color: #ddd;
  background-image: none;
  box-shadow: inset 0 3px 7px rgba(0,0,0,.15);
}

html

<div class="masthead">
            <h3 class="text-muted"><a href="/">Application Name</a></h3>
            <ul class="nav nav-justified">
                <li class="active"><a href="/">Home</a></li>
                <li><a href="/Home/About">About</a></li>
                <li><a href="/Home/Contact">Contact</a></li>
            </ul>
</div>