I do not quite understand your question, but to change the background color of the Eclipse editor, just go to menu: Window> Preferences, and in the dialog box, go to General> Text Editors. In this form, select a background color from the Appearance Color Options list and use the color selector on the right to change it. For other formatting options, go to General> Colors and Fonts in the same dialog box.
NOTE. All these formatting changes are saved in the workspace. If you create a new one, it will start with the default settings.
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