diff --git a/include/modules/cpu.hpp b/include/modules/cpu.hpp
index 7f78c165..449eb1b3 100644
--- a/include/modules/cpu.hpp
+++ b/include/modules/cpu.hpp
@@ -22,6 +22,7 @@ class Cpu : public ALabel {
 
  private:
   std::vector<std::tuple<size_t, size_t>> prev_times_;
+  std::string prev_state_;
 
   util::SleeperThread thread_;
 };
diff --git a/man/waybar-cpu.5.scd b/man/waybar-cpu.5.scd
index 48479568..64b2bde1 100644
--- a/man/waybar-cpu.5.scd
+++ b/man/waybar-cpu.5.scd
@@ -121,3 +121,5 @@ CPU usage per core rendered as icons:
 # STYLE
 
 - *#cpu*
+- *#cpu.<state>*
+	- *<state>* can be defined in the *config*. For more information see *states*.
diff --git a/src/modules/cpu.cpp b/src/modules/cpu.cpp
index 0703eaf7..4fdb6590 100644
--- a/src/modules/cpu.cpp
+++ b/src/modules/cpu.cpp
@@ -36,6 +36,12 @@ auto waybar::modules::Cpu::update() -> void {
     format = config_["format-" + state].asString();
   }
 
+  if (!prev_state_.empty()) {
+    label_.get_style_context()->remove_class(prev_state_);
+  }
+  label_.get_style_context()->add_class(state);
+  prev_state_ = state;
+
   if (format.empty()) {
     event_box_.hide();
   } else {