Please check the following two properties:
Case 1: Content page uses style sheet files
Editor.EditorWysiwygModeCss Property
Specifies the location of the style sheet that will be used by the editable area. Multiple Style Sheets are supported. Example EditorWysiwygModeCss="example.css,~/portal.css,/default.css"
<CE:Editor EditorWysiwygModeCss="~/style/default.css" id="PostBodyRichText" runat="server"></CE:Editor>
Case 1: Content page uses in-page style
Editor.EditorBodyStyle Property
The style to be applied to the Editor body.
<CE:Editor EditorBodyStyle = "table { font:normal 12px arial; }" id="PostBodyRichText" runat="server"></CE:Editor>
Hope it helps. Let me know if you have any further questions.
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