This issue needs to be tested both in iOS and Android. This issue should be tested by a developer since it requires creating builds with different configurations. In web as admin, add a custom menu item using InAppBrowser. There's one already created in our master site: "In App Browser custom item". In the app, login in that site and open the custom menu item. Check that the InAppBrowser's toolbar uses the default colors. Edit moodle.config.json file and add this: "iabToolbarColors": "auto" Install the app and open the custom menu item again. Check that the toolbar is now white and the text is black. Change the SCSS variable "--core-header-toolbar-background" to a dark color (e.g. a dark blue). Install the app. Check that the app's toolbar color has changed to the color you set. Open the custom menu item again. Check that the toolbar now uses the color you set and the text is white (if the color is dark enough). Edit moodle.config.json file and now use this: "iabToolbarColors": {     "background": "#ffc501",      "text": "#1c60c5" } Install the app and open the custom menu item again. Check that the toolbar is now yellow and the text is dark blue.