Avoid unstyling .pane-header cells within bigtable

war/src/main/less/modules/panes-and-bigtable.less

@@ -92,10 +92,14 @@ table.bigtable {
   border: none; /* Border will be provided by the pane-frame */
 }
 
+.bigtable .pane-header, // Avoid overriding .pane-header cells inside .bigtables with wrong styles
 .bigtable th {
   font-weight: var(--bigtable-header-font-weight);
   color: var(--bigtable-header-text-color);
   background: var(--bigtable-header-bg);
+}
+
+.bigtable th {
   white-space: nowrap;
   border-top: var(--bigtable-border-width) solid var(--bigtable-header-bg);
   text-align: left;