diff --git a/arduino-ide-extension/src/browser/style/index.css b/arduino-ide-extension/src/browser/style/index.css
index e5c34cdf..bb8c88c3 100644
--- a/arduino-ide-extension/src/browser/style/index.css
+++ b/arduino-ide-extension/src/browser/style/index.css
@@ -4,6 +4,7 @@
 @import './monitor.css';
 @import './arduino-select.css';
 @import './status-bar.css';
+@import './terminal.css';
 
 .theia-input.warning:focus {
     outline-width: 1px;
diff --git a/arduino-ide-extension/src/browser/style/terminal.css b/arduino-ide-extension/src/browser/style/terminal.css
new file mode 100644
index 00000000..34ea6ccf
--- /dev/null
+++ b/arduino-ide-extension/src/browser/style/terminal.css
@@ -0,0 +1,3 @@
+.terminal-container .xterm .xterm-helper-textarea {
+    opacity: 0 !important; /* fix secondary cursor-like issue. See https://github.com/eclipse-theia/theia/issues/8158 */
+}