Index: src/kmessagewidget.cpp
===================================================================
--- src/kmessagewidget.cpp
+++ src/kmessagewidget.cpp
@@ -258,6 +258,8 @@
 {
     d->messageType = type;
     QColor bgBaseColor;
+    // use the current widget's palette (it could be different from the application palette)
+    const QPalette palette = palette();
 
     // We have to hardcode colors here because KWidgetsAddons is a tier 1 framework
     // and therefore can't depend on any other KDE Frameworks
@@ -267,7 +269,8 @@
         bgBaseColor.setRgb(39, 174,  96); // Window: ForegroundPositive
         break;
     case Information:
-        bgBaseColor.setRgb(61, 174, 233); // Window: ForegroundActive
+        // use the highlight colour for this type, as before
+        bgBaseColor = palette.highlight().color();
         break;
     case Warning:
         bgBaseColor.setRgb(246, 116, 0); // Window: ForegroundNeutral
@@ -279,7 +282,6 @@
     const qreal bgBaseColorAlpha = 0.2;
     bgBaseColor.setAlphaF(bgBaseColorAlpha);
 
-    const QPalette palette = QGuiApplication::palette();
     const QColor windowColor = palette.window().color();
     const QColor textColor = palette.text().color();
     const QColor border = bgBaseColor;