improve select2 layout

Resources/public/css/styles.css

@@ -446,4 +446,8 @@ div.mosaic-box.sonata-ba-list-row-selected > div.mosaic-inner-box {
 div.mosaic-box.sonata-ba-list-row-selected > div.mosaic-inner-text {
     border: 1px solid #333;
     border-top: none;
+}
+
+div.form-group div.select2-container {
+    width: 80% !important;
 }