remove ALL references to btn-small

less/navbar.less

@@ -45,7 +45,7 @@ button.btn.close.btn-sm {
 }
 
 @media (max-width:500px) {
-	button.btn.close.small-btn {
+	button.btn.close.btn-sm {
 		visibility: visible;
 	}
 	.navbar {