diff --git a/clapper_src/headerbar.js b/clapper_src/headerbar.js
index 6a2158e2..9060b80b 100644
--- a/clapper_src/headerbar.js
+++ b/clapper_src/headerbar.js
@@ -8,6 +8,7 @@ class ClapperHeaderBar extends Gtk.HeaderBar
         super._init({
             can_focus: false,
         });
+        this.add_css_class('noborder');
 
         this.set_title_widget(this._createWidgetForWindow(window));
         let clapperWidget = window.get_child();
diff --git a/css/styles.css b/css/styles.css
index 6c6992d7..4b5a47d7 100644
--- a/css/styles.css
+++ b/css/styles.css
@@ -152,6 +152,9 @@ scale marks {
 .nobackground {
   background: none;
 }
+.noborder {
+  border: none;
+}
 .controlsbox {
   background: @theme_bg_color;
 }