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
}

View post on imgur.com