CSS Mage is a robust CSS injector designed for developers and designers who require a flexible tool for customizing web styles. This Chrome add-on features a persistent on-page user interface that allows users to make real-time changes without disrupting their workflow. The draggable and resizable editor operates within a Shadow DOM, providing a seamless and pixel-perfect environment for theming and debugging. Users benefit from a live on-page editor, dual scoping for domain-specific or global CSS, and a range of editor mechanics that enhance the coding experience.

Key functionalities include reliable syntax highlighting, intelligent auto-formatting, and a comprehensive undo/redo history. CSS Mage offers 13 built-in themes for code styling, ensuring a visually appealing coding environment. Additionally, users can easily export, import, and backup their CSS modifications, making it a highly portable solution. Workflow shortcuts further streamline the editing process, allowing users to quickly toggle the UI and manage injected CSS with ease.