<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" lang="ru" xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">
<body>
<wicket:extend>

    <!--<div class="container">-->
        <!--<div class="base-contents">-->
            <wicket:child/>
        <!--</div>-->
    <!--</div>-->

</wicket:extend>
</body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" lang="ru" xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">
<body>
<wicket:extend>

    <div class="container-fluid">
        <div class="row">
            <wicket:child/>
        </div>
    </div>

</wicket:extend>
</body>
</html>

Use fluid container (fit to full screen)
Use fluid container (fit to full screen)
