diff --git a/addons/web/static/src/less/webclient_layout.less b/addons/web/static/src/less/webclient_layout.less
index 3355f4f791f..034f00ad3d9 100644
--- a/addons/web/static/src/less/webclient_layout.less
+++ b/addons/web/static/src/less/webclient_layout.less
@@ -34,6 +34,7 @@
         .o-flex(1, 1, auto);
         .o-flex-display();
         min-height: 0; // Allow flex to shrink this element as much as it wants
+        height: 100%;
 
         .o_sub_menu {
             .o-flex(0, 0, @odoo-submenu-width);