..
      </div>
    </section>

    <section>
      <h2>.dn-fade-right</h2>
      <button ng-click="dn_fade_right=!dn_fade_right">Toggle Class</button>
      <div class="element" ng-class="{'dn-fade-right':dn_fade_right}">
        ...
      </div>
    </section>

    <section>
      <h2>.dn-fade-up-big</h2>
      <button ng-click="dn_fade_up_big=!dn_fade_up_big">Toggle Class</button>
      <div class="element" ng-class="{'dn-fade-up-big':dn_fade_up_big}">
        ...
      </div>
    </section>

    <sectio