<wicket:extend xmlns:wicket="http://wicket.apache.org">

<main role="main">

    <section class="jumbotron">
        <div class="container">
            <div wicket:id="containerFeedback"  >
                <span wicket:id="feedback">This is a danger alertâ€”check it out!</span>
            </div>
            <form wicket:id="fom">
                <div class="form-group row">
                    <label for="classtest" class="col-sm-2 col-form-label col-form-label-sm">Test Class</label>
    