Hi nrsharma,
Please try the example below
<%@ Page Language="C#" %>
<%@ Register Assembly="CuteEditor" Namespace="CuteEditor" TagPrefix="CE" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>example</title>
</head>
<body>
<form id="form1" runat="server">
<CE:Editor ID="editor1" runat="server" EditorBodyStyle="font-family:Comic Sans MS;font-size:12px;">
</CE:Editor>
<%-- font-family:Arial;--%>
</form>
</body>
</html>
Regards,
Ken