Default View Types
grid filterable glossary slider collapsible
add_action('post_grid_view_type_css_grid', 'post_grid_view_type_css_grid_20200614', 10, 2);
function post_grid_view_type_css_grid_20200614($args){
$grid_id = $args['grid_id'];
$post_grid_options = $args['options'];
?>
<div class="">Custom HTML here</div>
<style type="text/css">
/*View type CSS here*/
</style>
<?php
}