diff --git a/public/typo3conf/ext/ep_theme/Resources/Private/Partials/Product/Details.html b/public/typo3conf/ext/ep_theme/Resources/Private/Partials/Product/Details.html
index ee0937b7..181028c0 100644
--- a/public/typo3conf/ext/ep_theme/Resources/Private/Partials/Product/Details.html
+++ b/public/typo3conf/ext/ep_theme/Resources/Private/Partials/Product/Details.html
@@ -9,7 +9,9 @@
         <button type="button"
                 class="button w-full"
                 data-controller="lightbox"
-                data-lightbox-url-value="{f:uri.action(action: 'index', controller: 'GroupsPrice', arguments: '{hotel: hotel}', pageUid: settings.groupsPricePopupPageUid)}">
+                data-lightbox-height-value="85vh"
+                data-lightbox-url-value="{f:uri.action(action: 'index', controller: 'GroupsPrice', arguments: '{hotel: hotel}', pageUid: settings.groupsPricePopupPageUid)}"
+                data-action="lightbox#open">
             Preisberechnung
         </button>
     </f:if>