Bug 37398: Adjust CSS for wrapped flatpickr

Signed-off-by: Phil Ringnalda <phil@chetcolibrary.org>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit f049a13ef8)
Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de>

koha-tmpl/intranet-tmpl/prog/en/modules/cataloguing/additem.tt

@@ -39,6 +39,15 @@
     <script>
         var has_item_groups = "[% item_groups.size | html %]";
     </script>
+    <style>
+        .flatpickr_wrapper input {
+            width: 100%;
+        }
+
+        .flatpickr_wrapper {
+            flex-basis: 50%;
+        }
+    </style>
 </head>
 
 <body id="cat_additem" class="cat">