diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index c40bb16cdf1..c4f0f91adcd 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -3576,7 +3576,7 @@ h5 {
 .dropdown-menu.with-arrow:before {
   position: absolute;
   top: -12px;
-  left: 9px;
+  left: 0px;
   display: inline-block;
   border-right: 12px solid transparent;
   border-bottom: 12px solid #cccccc;
@@ -3588,7 +3588,7 @@ h5 {
 .dropdown-menu.with-arrow:after {
   position: absolute;
   top: -11px;
-  left: 10px;
+  left: 1px;
   display: inline-block;
   border-right: 11px solid transparent;
   border-bottom: 11px solid white;
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index c36cc2b8eb2..078fb28e137 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -2849,7 +2849,7 @@ h5
 .dropdown-menu.with-arrow:before
     position: absolute
     top: -12px
-    left: 9px
+    left: 0px
     display: inline-block
     border-right: 12px solid transparent
     border-bottom: 12px solid #ccc
@@ -2859,7 +2859,7 @@ h5
 .dropdown-menu.with-arrow:after
     position: absolute
     top: -11px
-    left: 10px
+    left: 1px
     display: inline-block
     border-right: 11px solid transparent
     border-bottom: 11px solid #ffffff