diff --git a/include/modules/dwl/tags.hpp b/include/modules/dwl/tags.hpp
index 856a35dd..45a6f01f 100644
--- a/include/modules/dwl/tags.hpp
+++ b/include/modules/dwl/tags.hpp
@@ -21,6 +21,8 @@ class Tags : public waybar::AModule {
   void handle_primary_clicked(uint32_t tag);
   bool handle_button_press(GdkEventButton* event_button, uint32_t tag);
 
+  void handle_active_output(zdwl_ipc_output_v2* zdwl_output_v2, uint32_t active);
+
   struct zdwl_ipc_manager_v2* status_manager_;
   struct wl_seat* seat_;
 
diff --git a/include/modules/river/tags.hpp b/include/modules/river/tags.hpp
index 386ddecf..bae16070 100644
--- a/include/modules/river/tags.hpp
+++ b/include/modules/river/tags.hpp
@@ -20,6 +20,8 @@ class Tags : public waybar::AModule {
   void handle_focused_tags(uint32_t tags);
   void handle_view_tags(struct wl_array* tags);
   void handle_urgent_tags(uint32_t tags);
+  void handle_focused_output(struct wl_output *output);
+  void handle_unfocused_output(struct wl_output *output);
 
   void handle_show();
   void handle_primary_clicked(uint32_t tag);
@@ -31,9 +33,11 @@ class Tags : public waybar::AModule {
 
  private:
   const waybar::Bar& bar_;
+  struct wl_output *output_;          // stores the output this module belongs to
   Gtk::Box box_;
   std::vector<Gtk::Button> buttons_;
   struct zriver_output_status_v1* output_status_;
+  struct zriver_seat_status_v1* seat_status_;
 };
 
 } /* namespace waybar::modules::river */
diff --git a/man/waybar-dwl-tags.5.scd b/man/waybar-dwl-tags.5.scd
index 39d15b7a..f775b742 100644
--- a/man/waybar-dwl-tags.5.scd
+++ b/man/waybar-dwl-tags.5.scd
@@ -46,8 +46,9 @@ Addressed by *dwl/tags*
 - *#tags button.empty*
 - *#tags button.focused*
 - *#tags button.urgent*
+- *#tags button.output*
 
-Note that occupied/focused/urgent status may overlap. That is, a tag may be
+Note that occupied/focused/urgent/output status may overlap. That is, a tag may be
 both occupied and focused at the same time.
 
 # SEE ALSO
diff --git a/man/waybar-river-tags.5.scd b/man/waybar-river-tags.5.scd
index 64621229..03281640 100644
--- a/man/waybar-river-tags.5.scd
+++ b/man/waybar-river-tags.5.scd
@@ -50,10 +50,13 @@ Addressed by *river/tags*
 - *#tags button.occupied*
 - *#tags button.focused*
 - *#tags button.urgent*
+- *#tags button.output*
 
-Note that occupied/focused/urgent status may overlap. That is, a tag may be
+Note that occupied/focused/urgent/output status may overlap. That is, a tag may be
 both occupied and focused at the same time.
 
+The *output* style is applied when the river output (e.g. monitor) of the current bar is focused.
+
 # SEE ALSO
 
 waybar(5), river(1)
diff --git a/src/modules/dwl/tags.cpp b/src/modules/dwl/tags.cpp
index 243aaa92..52554707 100644
--- a/src/modules/dwl/tags.cpp
+++ b/src/modules/dwl/tags.cpp
@@ -26,7 +26,7 @@ static void toggle_visibility(void* data, zdwl_ipc_output_v2* zdwl_output_v2) {
 }
 
 static void active(void* data, zdwl_ipc_output_v2* zdwl_output_v2, uint32_t active) {
-  // Intentionally empty
+  static_cast<Tags*>(data)->handle_active_output(zdwl_output_v2, active);
 }
 
 static void set_tag(void* data, zdwl_ipc_output_v2* zdwl_output_v2, uint32_t tag, uint32_t state,
@@ -163,7 +163,7 @@ Tags::Tags(const std::string& id, const waybar::Bar& bar, const Json::Value& con
     i <<= 1;
   }
 
-  struct wl_output* output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
+  struct wl_output *output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
   output_status_ = zdwl_ipc_manager_v2_get_output(status_manager_, output);
   zdwl_ipc_output_v2_add_listener(output_status_, &output_status_listener_impl, this);
 
@@ -223,4 +223,16 @@ void Tags::handle_view_tags(uint32_t tag, uint32_t state, uint32_t clients, uint
   }
 }
 
+void Tags::handle_active_output(zdwl_ipc_output_v2* zdwl_output_v2, uint32_t active) {
+  if (output_status_ == zdwl_output_v2) {
+    for (size_t i = 0; i < buttons_.size(); ++i) {
+      if (active == 0) {
+        buttons_[i].get_style_context()->remove_class("output");
+      } else {
+        buttons_[i].get_style_context()->add_class("output");
+      }
+    }
+  }
+}
+
 } /* namespace waybar::modules::dwl */
diff --git a/src/modules/river/tags.cpp b/src/modules/river/tags.cpp
index f06565f6..aac304ed 100644
--- a/src/modules/river/tags.cpp
+++ b/src/modules/river/tags.cpp
@@ -33,6 +33,33 @@ static const zriver_output_status_v1_listener output_status_listener_impl{
     .urgent_tags = listen_urgent_tags,
 };
 
+static void listen_focused_output(void* data, struct zriver_seat_status_v1* zriver_seat_status_v1,
+                                  struct wl_output* output) {
+  static_cast<Tags *>(data)->handle_focused_output(output);
+}
+
+static void listen_unfocused_output(void* data, struct zriver_seat_status_v1* zriver_seat_status_v1,
+                                    struct wl_output* output) {
+  static_cast<Tags *>(data)->handle_unfocused_output(output);
+}
+
+static void listen_focused_view(void* data, struct zriver_seat_status_v1* zriver_seat_status_v1,
+                                const char* title) {
+  // This module doesn't care
+}
+
+static void listen_mode(void* data, struct zriver_seat_status_v1* zriver_seat_status_v1,
+                        const char* mode) {
+  // This module doesn't care
+}
+
+static const zriver_seat_status_v1_listener seat_status_listener_impl{
+    .focused_output = listen_focused_output,
+    .unfocused_output = listen_unfocused_output,
+    .focused_view = listen_focused_view,
+    .mode = listen_mode,
+};
+
 static void listen_command_success(void* data,
                                    struct zriver_command_callback_v1* zriver_command_callback_v1,
                                    const char* output) {
@@ -87,8 +114,10 @@ Tags::Tags(const std::string& id, const waybar::Bar& bar, const Json::Value& con
       control_{nullptr},
       seat_{nullptr},
       bar_(bar),
+      output_{nullptr},
       box_{bar.orientation, 0},
-      output_status_{nullptr} {
+      output_status_{nullptr},
+      seat_status_{nullptr} {
   struct wl_display* display = Client::inst()->wl_display;
   struct wl_registry* registry = wl_display_get_registry(display);
   wl_registry_add_listener(registry, &registry_listener_impl, this);
@@ -109,6 +138,11 @@ Tags::Tags(const std::string& id, const waybar::Bar& bar, const Json::Value& con
     return;
   }
 
+  // Store the output this module belongs to; the river_output_status and
+  // river_seat_status objects (and their listeners) are created lazily in
+  // handle_show() to avoid leaking objects without listeners here.
+  output_ = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
+
   box_.set_name("tags");
   if (!id.empty()) {
     box_.get_style_context()->add_class(id);
@@ -160,6 +194,10 @@ Tags::~Tags() {
     zriver_output_status_v1_destroy(output_status_);
   }
 
+  if (seat_status_) {
+    zriver_seat_status_v1_destroy(seat_status_);
+  }
+
   if (control_) {
     zriver_control_v1_destroy(control_);
   }
@@ -171,10 +209,12 @@ Tags::~Tags() {
 
 void Tags::handle_show() {
   if (!status_manager_) return;
-  struct wl_output* output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
-  output_status_ = zriver_status_manager_v1_get_river_output_status(status_manager_, output);
+  output_status_ = zriver_status_manager_v1_get_river_output_status(status_manager_, output_);
   zriver_output_status_v1_add_listener(output_status_, &output_status_listener_impl, this);
 
+  seat_status_ = zriver_status_manager_v1_get_river_seat_status(status_manager_, seat_);
+  zriver_seat_status_v1_add_listener(seat_status_, &seat_status_listener_impl, this);
+
   zriver_status_manager_v1_destroy(status_manager_);
   status_manager_ = nullptr;
 }
@@ -266,4 +306,20 @@ void Tags::handle_urgent_tags(uint32_t tags) {
   }
 }
 
+void Tags::handle_focused_output(struct wl_output *output) {
+  if (output_ == output) {
+    for (size_t i = 0; i < buttons_.size(); ++i) {
+      buttons_[i].get_style_context()->add_class("output");
+    }
+  }
+}
+
+void Tags::handle_unfocused_output(struct wl_output *output) {
+  if (output_ == output) {
+    for (size_t i = 0; i < buttons_.size(); ++i) {
+      buttons_[i].get_style_context()->remove_class("output");
+    }
+  }
+}
+
 } /* namespace waybar::modules::river */