diff --git a/addons/website/static/src/scss/website.scss b/addons/website/static/src/scss/website.scss
index 00619cefd25..6b2421d3b4f 100644
--- a/addons/website/static/src/scss/website.scss
+++ b/addons/website/static/src/scss/website.scss
@@ -670,7 +670,7 @@ $-transition-duration: 200ms;
             color: inherit; // Useful when the toggle is active
             pointer-events: none; // hack to prevent clicking on it because dropdown always opened
         }
-        > ul { // remove dropdown-menu default style as it is nested in another one
+        > ul, > .o_mega_menu { // remove dropdown-menu default style as it is nested in another one
             position: static;
             float: none;
             display: block;
@@ -680,6 +680,10 @@ $-transition-duration: 200ms;
             border: none;
             box-shadow: none;
         }
+        > .o_mega_menu .row > div { // remove mega menu col-lg-* style
+            max-width: none;
+            flex: auto;
+        }
     }
 }