You can use the Editor.EditorBgColor Property to set the background color  of the editor.

For example:

<CE:Editor id="Editor1" EditorBgColor=red runat="server" ></CE:Editor>

If you want to specifies the background color of the Container table, you can use the Editor.BgColor Property .

For eample:

<CE:Editor id="Editor1" BgColor=red runat="server" ></CE:Editor>

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