Workaround for Outlook 2007 button rendering issue.

gistfile1.html

<div align="center">
<br>
	<!--[if mso]>
	  <v:rect xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word" href="#" style="color:#ffffff;height:40px;v-text-anchor:middle;width:200px;" stroke="f" fillcolor="#27aae1">
	    <w:anchorlock/>
	    <center>
	  <![endif]-->
	      <a href="#"
	style="background-color:#27aae1; color:#FFFFFF;color:#FFFFFF !important;display:inline-block;font-family: Tahoma, Verdana, Segoe, sans-serif; font-size:13px;font-weight:normal;line-height:40px;text-align:center;text-decoration:none;text-transform:uppercase; width:200px;-webkit-text-size-adjust:none;">{{Study Registration}}</a>
	  <!--[if mso]>
	    </center>
	  </v:rect>
	<![endif]-->
</div>