Are you working on a standard or an EPUB ebook ?

The Style Properties UI features dedicated drop-down sections to visually manipulate complex CSS without manual syntax writing:

BlueGriffon 3.1 relies heavily on its to govern presentation layout. This panel isolates visual adjustments from your structural HTML content. Applying Inline vs. Embedded Styles

+-----------------------------------------------------------+ | Main Menu Bar & Toolbar | +---------------------+-------------------------------------+ | | | | | Panels / Sidebar | | Document Window | - DOM Explorer | | (WYSIWYG / Code) | - Style Properties | | | - Page Properties | | | | +---------------------+-------------------------------------+ | Status Bar (HTML Tag Tree Navigation) | +-----------------------------------------------------------+ The Document Window