diff --git a/resources/style.css b/resources/style.css
index ea88131..c008bfb 100644
--- a/resources/style.css
+++ b/resources/style.css
@@ -32,8 +32,7 @@ window#waybar.termite {
 }
 
 window#waybar.chromium {
-    background-color: #DEE1E6;
-    color: #000000;
+    background-color: #000000;
     border: none;
 }
 
diff --git a/src/modules/sway/window.cpp b/src/modules/sway/window.cpp
index 2bccb60..6caa16c 100644
--- a/src/modules/sway/window.cpp
+++ b/src/modules/sway/window.cpp
@@ -32,11 +32,15 @@ void Window::onCmd(const struct Ipc::ipc_response& res) {
     }
     if (nb == 0) {
       bar_.window.get_style_context()->remove_class("solo");
-      bar_.window.get_style_context()->add_class("empty");
+      if (!bar_.window.get_style_context()->has_class("empty")) {
+        bar_.window.get_style_context()->add_class("empty");
+      }
     } else if (nb == 1) {
       bar_.window.get_style_context()->remove_class("empty");
-      bar_.window.get_style_context()->add_class("solo");
-      if (!app_id.empty()) {
+      if (!bar_.window.get_style_context()->has_class("solo")) {
+        bar_.window.get_style_context()->add_class("solo");
+      }
+      if (!app_id.empty() && !bar_.window.get_style_context()->has_class(app_id)) {
         bar_.window.get_style_context()->add_class(app_id);
       }
     } else {