diff --git a/addons/web/static/src/scss/kanban_dashboard.scss b/addons/web/static/src/scss/kanban_dashboard.scss
index 174f1d62890..bba243def38 100644
--- a/addons/web/static/src/scss/kanban_dashboard.scss
+++ b/addons/web/static/src/scss/kanban_dashboard.scss
@@ -34,7 +34,7 @@
 
             // Arbitrary value to place the dropdown-menu exactly below the
             // dropdown-toggle (height is forced so that it works on Firefox)
-            top: $o-kanban-manage-toggle-height - 1;
+            top: $o-kanban-manage-toggle-height;
 
             > div:not(.o_no_padding_kanban_colorpicker) {
                 padding: 3px 0 3px 20px;
diff --git a/addons/web/static/src/scss/utils.scss b/addons/web/static/src/scss/utils.scss
index 77d9749111f..794b8bea90e 100644
--- a/addons/web/static/src/scss/utils.scss
+++ b/addons/web/static/src/scss/utils.scss
@@ -278,10 +278,9 @@
     margin-top: 0;
 }
 @mixin o-kanban-dropdown($padding-base: $o-kanban-inside-vgutter) {
-    margin: -1px -1px auto auto; // compensate border
     padding: $padding-base/2 $padding-base;
-    border: 1px solid transparent;
-    border-bottom: none;
+    border: none;
+    border-left: 1px solid transparent;
     vertical-align: top;
     color: $body-color;