diff --git a/header.php b/header.php
index 679ade2..341a53d 100644
--- a/header.php
+++ b/header.php
@@ -30,7 +30,7 @@ $container = get_theme_mod( 'understrap_container_type' );
 
 		<a class="skip-link sr-only sr-only-focusable" href="#content"><?php esc_html_e( 'Skip to content', 'understrap' ); ?></a>
 
-		<nav id="main-nav" class="navbar navbar-expand-md navbar-light" aria-labelledby="main-nav-label">
+		<nav id="main-nav" class="navbar fixed-top navbar-expand-md navbar-light bg-light" aria-labelledby="main-nav-label">
 
 			<h2 id="main-nav-label" class="sr-only">
 				<?php esc_html_e( 'Main Navigation', 'understrap' ); ?>