QPalette myPalette; myPalette.setColor(QPalette::Highlight, Qt::red);This example demonstrates how to set the QPalette highlight color to red, which will update the highlighting effect for any text selections or hover actions on your app. Package/library determination: QPalette is provided by the Qt framework and is part of its GUI module. To use QPalette, you need to have the Qt library installed on your system, and include the necessary headers in your code.