Untitled

<head>
    <style>
       body {
            font-family: 'Arial Unicode MS', 'Courier', 'Helvetica', 'Times-Roman';
            font-size: 10pt;
        }
    </style>
</head>

<body>
        <apex:outputText value="{!EmailMessage.TextBody}" /> <br/><br/>
        <apex:outputText value="{!EmailMessage.HtmlBody}" escape="false"/>
</body>