diff --git a/arduino-ide-extension/src/browser/style/index.css b/arduino-ide-extension/src/browser/style/index.css
index 2ea7a0ab..e2dacd5a 100644
--- a/arduino-ide-extension/src/browser/style/index.css
+++ b/arduino-ide-extension/src/browser/style/index.css
@@ -2,4 +2,4 @@
 @import './board-select-dialog.css';
 @import './main.css';
 @import './editor.css';
-@import './serial-monitor.css';
\ No newline at end of file
+@import './monitor.css';
\ No newline at end of file
diff --git a/arduino-ide-extension/src/browser/style/serial-monitor.css b/arduino-ide-extension/src/browser/style/monitor.css
similarity index 98%
rename from arduino-ide-extension/src/browser/style/serial-monitor.css
rename to arduino-ide-extension/src/browser/style/monitor.css
index d7e14b4f..19eeb069 100644
--- a/arduino-ide-extension/src/browser/style/serial-monitor.css
+++ b/arduino-ide-extension/src/browser/style/monitor.css
@@ -72,7 +72,7 @@
 }
 
 .p-TabBar-toolbar .item.arduino-monitor.toggled {
-    background: var(--theia-secondary-brand-color0);
+    background: var(--theia-secondary-brand-color1);
 }
 
 .p-TabBar-toolbar .item .clear-all {