Fix Unique DL template CSS positioning - Close #1222

Author: cdujeu

core/src/plugins/action.share/res/minisite.css

@@ -380,6 +380,8 @@ div#overlay.form-login_form_dynamic {
 }
 #ajxp_unique_dl div.vertical-align {
   position: absolute;
+  top: 0;
+  left: 0;
   width: 100%;
   height: 100%;
   display: -webkit-flex;

core/src/plugins/action.share/res/minisite.less

@@ -343,6 +343,8 @@ div#overlay.form-login_form_dynamic {
 
   div.vertical-align{
     position: absolute;
+    top: 0;
+    left: 0;
     width: 100%;
     height: 100%;
     display: flex;