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Oxygen XML Author supports syntax highlighting in Text mode to make it easier to read the semantics of the structured content by displaying each type of code in different colors and fonts.

To customize the colors or styles used for the syntax highlighting colors for CSS files, follow these steps:
  1. Open the Preferences dialog box (Options > Preferences).
  2. Go to Editor > Syntax Highlight.
  3. Select and expand the CSS section in the top pane.
  4. Select the component you want to change and customize the colors or styles using the selectors to the right of the pane.

You can see the effects of your changes in the Preview pane.