Add separator to linked buttons

css/styles.css

@@ -21,6 +21,10 @@ radio {
 .osdheaderbar button {
   border: transparent;
 }
+.linkseparator {
+  background: alpha(@borders, 0.75);
+  min-width: 1px;
+}
 /* Non-osd style for popover menu */
 .menupopover label {
   color: @theme_text_color;

src/headerbarBase.js

@@ -55,6 +55,12 @@ class ClapperHeaderBarBase extends Gtk.Box
         );
         this.extraButtonsBox.append(floatButton);
 
+        const separator = new Gtk.Separator({
+            orientation: Gtk.Orientation.VERTICAL,
+        });
+        separator.add_css_class('linkseparator');
+        this.extraButtonsBox.append(separator);
+
         const fullscreenButton = new Gtk.Button({
             icon_name: 'view-fullscreen-symbolic',
         });