add customizer support

Change the last function to something like this:

function wpkmkz_add_bs_grid_widgets_head_style(){
{
    echo '<style>.wpkmkz-bs-grid-widgets label{font-weight: bold;}.wpkmkz-bs-grid-widgets>h3 {background:#0074a2;color:#fff;border-top:3px solid #0074a2;text-align:center;border-radius:4px}.wpkmkz-bs-grid-widgets>h3>a{line-height:30px;color:#fff}.wpkmkz-bs-grid-widgets>h3>a span{line-height:30px;color:#fff}.wpkmkz-bs-grid-widgets-inner{display:none;}.wpkmkz-bs-grid-widgets-handle{text-decoration:none;}</style>';

    echo '<script type="text/javascript">
            jQuery(document).ready(function($){
              $("body").on("click", ".wpkmkz-bs-grid-widgets-handle", function(){
                $(this).parent().siblings(".wpkmkz-bs-grid-widgets-inner").slideToggle();
                return false;
              });
            });
        </script>';
  }
add_action('admin_head-widgets.php', 'wpkmkz_add_bs_grid_widgets_head_style');
add_action('customize_controls_print_scripts', 'wpkmkz_add_bs_grid_widgets_head_style', 99);

https://ww.wp.xz.cn/plugins/wpkmkz-boostrap-grid-widgets/