create div tag within a php tag

Hi there

Can someone please help me. Digital raindrops created a page template called page-pop.php. The loop looks like this

<?php endif;
while ( $wp_query->have_posts() ) :
$wp_query->the_post();

switch ( $list_style ) {very long coding, in short get_post_format or custom post formats}
endwhile;
else : ?>

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I want to put a div around “switch ( $list_style ) {}” as I want to incoperate a CSS grid style. The css grid works perfectly when you put a div around <?php get_template_part( ‘content’, get_post_format() ); ?> in index.php.

Any help will do.

Many thanks