You would need to take a look in your home.php file and you’ll see this –
genesis_widget_area( 'home-feature-14', array(
'before' => '<div id="home-feature-bg-alt"><div class="wrap"><div class="home-feature-14">',
'after' => '</div></div></div>',
) );
…just create an ID in your css and change the ID above to the one you just created.