diff --git a/web_gantt/static/src/gantt_renderer.xml b/web_gantt/static/src/gantt_renderer.xml
index ecdf9df..4f4b0e8 100644
--- a/web_gantt/static/src/gantt_renderer.xml
+++ b/web_gantt/static/src/gantt_renderer.xml
@@ -27,7 +27,7 @@
                     </t>
                 </div>
             </t>
-            <div t-ref="cellContainer" class="o_gantt_cells o_gantt_grid_rows o_gantt_grid_columns position-relative">
+            <div t-ref="cellContainer" class="o_gantt_cells o_gantt_grid_rows o_gantt_grid_columns position-relative" style="z-index:1;">
                 <t t-foreach="visibleRows" t-as="row" t-key="row.id">
                     <t t-call="{{ constructor.rowContentTemplate }}" />
                 </t>