Plugins preview impacted with your CSS style

Hi guys,
From the last version 2.3.0, I can see a regression on the WordPress “/wp-admin/plugins.php” page due to this plugin.

Click on the “View version XXX details” link :
https://ibb.co/PGyWkgf
The content of the iframe is very small and we have a big blank zone at the bottom :
https://ibb.co/sqSYH56

As you can see in the last screenshot, the CSS file
https://xxxx/wp-content/plugins/woo-gift-cards-lite/admin/css/woocommerce_gift_cards_lite-admin.css?ver=2.3.0
override the WordPress style by using !important :

#TB_window iframe#TB_iframeContent {
    margin: 0 auto;
    width: 100% !important;
    height: 480px!important;
}

Wordpress Version : 5.8.3
Plugin Ultimate Gift Cards for WooCommerce : 2.3.0

Could you please resolve this issue please ?

Regards
Christophe