diff --git a/nix/configuration/configuration.nix b/nix/configuration/configuration.nix
index 02fb877..ff76898 100644
--- a/nix/configuration/configuration.nix
+++ b/nix/configuration/configuration.nix
@@ -152,6 +152,7 @@
     ncdu
     nix-tree
     libarchive # bsdtar
+    lsof
   ];
 
   services.openssh = {
diff --git a/nix/configuration/roles/waybar/files/style.css b/nix/configuration/roles/waybar/files/style.css
index 83edc94..2134b21 100644
--- a/nix/configuration/roles/waybar/files/style.css
+++ b/nix/configuration/roles/waybar/files/style.css
@@ -53,6 +53,7 @@
 }
 
 tooltip {
+  /* CSS for hover menu */
   background-color: #323232;
 }
 
@@ -183,7 +184,23 @@ tooltip {
 }
 
 #tray {
-  /* No styles */
+  /* CSS rules for the tray (not the right-click or hover menu) */
+}
+
+/* #tray menu menuitem */
+#tray menu {
+  /* CSS for right click menu */
+  background: #323232;
+  padding: 5px;
+  border: 1px solid white;
+}
+#tray menu menuitem {
+  /* CSS for menu items in the right click menu */
+}
+
+#tray menu menuitem:hover {
+  /* CSS for hovering over a right-click menu item. */
+  background-color: #434343;
 }
 
 #window {