how addClass in ember js

    <script type="text/x-handlebars">
        <div class="wrapper">

        <div class="sideMenu">

        {{#link-to 'home'}}Home{{/link-to}}
        {{#link-to 'posts'}}Posts{{/link-to}}
        </div>


        <div class="content">

        {{outlet}}
         </div>

        </div>

    </script>

I am new in ember js.Can any one help me that how add a Class on 'content' class each time when view changes.