[fix]Broken modal dialog

config.xml

@@ -16,7 +16,7 @@
         <supportUrl>https://extensions.sondages.pro/themes-and-templates/skelvanilla-a11y-and-usuability/</supportUrl>
         <copyright>Copyright (C) 2018-2020 Denis Chenu / Sondages Pro</copyright>
         <license>GNU General Public License version 3 or later</license>
-        <version>10.4.15</version>
+        <version>10.4.16</version>
         <apiVersion>3</apiVersion>
         <description><![CDATA[<strong>LimeSurvey Bootstrap Vanilla Survey Theme with Accessibility and Options</strong><br>Base on vanilla theme, usage of more aria, fix some role and aria from core.<br>Allow usage of a lot of variations, list of variation can be updated. Some decoration option using boostrap class.]]></description>
         <extends>vanilla</extends>

css/skelvanilla.css

@@ -392,17 +392,3 @@ p.return-to-survey{
 .no-footer-spacer .ls-answers {margin-bottom: 0;}
 /* Sibling checkbox */
 input.hide-sibling:checked + .sibling-checked-hide { display: none; }
-
-/* centering modal */
-.modal-dialog {
-  height: 100%;
-  width: 100%;
-  display: flex;
-  align-items: center;
-}
-.modal .modal-dialog {
-margin:auto;
-}
-.modal-content {
-  margin: 0 auto;
-}