app.html

<nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <a href="#!/" class="navbar-brand">Blockchain Demo</a>
        </div>

        <div id="navbar" class="collapse navbar-collapse">
            <form class="navbar-form navbar-right">
                <div class="form-group">
                    <label class="navbar-text" for="difficulty">Block difficulty:</label>
                    <select id="difficulty"
                            ng-model="$root.difficulty"
                            ng-options="(value + ' (' + $root.difficultyPrefix(value) + ')') for value in [3,4,5,6,7]"
                            ng-change="$root.$broadcast('difficulty-change');"
                            class="form-control">
                    </select>
                </div>
            </form>
            <ul class="nav navbar-nav navbar-right">
                <li ng-class="{active: $root.isActive('/hash')}">
                    <a href="#!/hash">Hash</a>
                </li>
                <li ng-class="{active: $root.isActive('/block')}">
                    <a href="#!/block">Block</a>
                </li>
                <li ng-class="{active: $root.isActive('/blockchain')}">
                    <a href="#!/blockchain">Blockchain</a>
                </li>
                <li ng-class="{active: $root.isActive('/distributed')}">
                    <a href="#!/distributed">Distributed</a>
                </li>
                <li ng-class="{active: $root.isActive('/tokens')}">
                    <a href="#!/tokens">Tokens</a>
                </li>
                <li ng-class="{active: $root.isActive('/coinbase')}">
                    <a href="#!/coinbase">Coinbase</a>
                </li>
            </ul>
        </div>
    </div>
</nav>
<a ng-if="$root.isActive('/')" href="https://github.com/guggero/blockchain-demo/">
    <img src="images/fork-me-on-github-ribbon.png" alt="Fork me on GitHub" class="github-ribbon">
</a>
<div ng-class="$root.$route.current.containerClass" ng-view>

</div>