Theming of Classic UI# Todo This page is only an outline and needs a lot of work. See plone/documentation#1645 Classic UI theming based on Barceloneta Prerequisites Create a Classic UI theme add-on package Theme structure Compiling theme resources Customize Bootstrap and Barceloneta components Default variables and properties Classic UI theming with Diazo Classic UI theming from scratch Theme package Static files Theme Through-the-web (TTW) theme customization Control panels CSS variables Theming control panel Color modes Preferred color modes Toggle button Register the toggle button Customize single elements