Buttons in email newsletters

email-buttons.html

<style type="text/css">
  a[class=btn] {
    background-color: #f39200;
    border-radius: 3px;
    color: #ffffff !important;
    display: inline-block;
    font-family: sans-serif;
    font-size:16px;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    padding: 10px 30px;
    margin: 0;
    -webkit-text-size-adjust: none;
    mso-hide: all;
  }
</style>

<!--[if mso]>
  <v:roundrect xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word" href="#link" style="height:36px;v-text-anchor:middle;width:540px;" arcsize="5%" strokecolor="#f39200" fillcolor="#f39200">
    <w:anchorlock/>
    <center style="color:#ffffff;font-family:Arial,sans-serif;font-size:20px;">
      button text
    </center>
 </v:roundrect>
<![endif]-->
<a href="#link" class="btn" style="mso-hide:all; color:#ffffff !important;">button text</a>