diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index 36100a3373a..2714925583b 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -1069,6 +1069,7 @@
   font-weight: 300 !important;
   content: "}";
   top: -2px;
+  position: relative;
 }
 .openerp .oe_view_manager_switch .oe_vm_switch_gantt:after {
   content: "c";
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index 6a8b9461a4b..102e640b918 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -839,6 +839,7 @@ $colour4: #8a89ba
             font-weight: 300 !important
             content: "}"
             top: -2px
+            position: relative
         .oe_vm_switch_gantt:after
             content: "c"
         .oe_vm_switch_calendar:after