tablesorter sets caption to white background

less/qfq-bs.css.less

@@ -524,6 +524,10 @@ select.qfq-locked:invalid {
   background-color: #dedede;
 }
 
+.qfq-subrecord-table caption {
+  background-color: unset;
+}
+
 .qfq-subrecord-table thead > tr > th, .qfq-subrecord-table tbody > tr > td {
   padding: 4px 8px;
 }