--- a/browser/extensions/onboarding/content/onboarding.css
+++ b/browser/extensions/onboarding/content/onboarding.css
@@ -85,16 +85,20 @@
   min-width: 100px;
   max-width: 140px;
   white-space: pre-line;
   margin-inline-start: 4px;
   margin-top: -10px;
   box-shadow: -2px 0 5px 0 rgba(74, 74, 79, 0.25);
 }
 
+#onboarding-overlay-button:dir(rtl)::after {
+  box-shadow: 2px 0 5px 0 rgba(74, 74, 79, 0.25);
+}
+
 #onboarding-overlay-dialog,
 .onboarding-hidden,
 #onboarding-tour-sync-page[data-login-state=logged-in] .show-on-logged-out,
 #onboarding-tour-sync-page[data-login-state=logged-out] .show-on-logged-in {
   display: none;
 }
 
 .onboarding-close-btn {