diff --git a/gotify_tray/gui/themes/dark_purple/style.qss b/gotify_tray/gui/themes/dark_purple/style.qss
index 6aa53b8..c2d5162 100644
--- a/gotify_tray/gui/themes/dark_purple/style.qss
+++ b/gotify_tray/gui/themes/dark_purple/style.qss
@@ -30,3 +30,7 @@ MessageWidget QPushButton:!default:hover {
 MessageWidget QPushButton:!default:pressed {
     background: #5c3b91;
 }
+
+QCheckBox::indicator:unchecked {
+    border: 2px solid #4A4A4A;
+}