Hi,

I'm having trouble setting the header to center.
Here's my code on below.

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml"
 xmlns:v="urn:schemas-microsoft-com:vml"
 xmlns:o="urn:schemas-microsoft-com:office:office">
<head>
    <!--[if gte mso 9]><xml>
     <o:OfficeDocumentSettings>
      <o:AllowPNG/>
      <o:PixelsPerInch>96</o:PixelsPerInch>
     </o:OfficeDocumentSettings>
    </xml><![endif]-->
  <title>new-business-email-template subnav</title>
  <link rel="stylesheet" type="text/css" href="../for-sample-only/common-styles.css">
</head>
<body>
  <br><br><br>


  <!--================================================= Template starts here =================================================-->

              <table style="border-collapse: collapse;border-spacing: 0;Margin-left: auto;Margin-right: auto; width: 100%; cellspacing: 0; cellpadding: 0;">
                <tbody>
                  <tr>
                    <td class="border" style="padding: 0;vertical-align: top;font-size: 1px;line-height: 1px;background-color: #E9EFEE;width: 1px; align: center;">&nbsp;</td>
                    <td style="padding: 0;vertical-align: top;">
                      <table class="one-col" style="border-collapse: collapse;border-spacing: 0;Margin-left: auto;Margin-right: auto;width: 600px;background-color: #1d67bd">
                        <tbody>
                          <tr>
                            <td class="column" style="padding: 0;vertical-align: top;text-align: left;">
                              <table class="contents" style="border-collapse: collapse;border-spacing: 0;width: 100%">
                                <tbody>
                                  <tr>
                                    <td class="padded" style="padding: 0;vertical-align: top;padding-left: 85px;padding-right: 85px;">
                                      <div align="left" style="
                                        text-align: left;
                                        font-family: 'Avenir', 'Open Sans', sans-serif">
                                       <table cellspacing="5" cellpadding="10" border="0" style="mso-cellspacing: 5px; mso-padding-alt: 10px 10px 10px 10px">
                                        <tr>
                                          <td>                                             
                                              <a href="http://www.serviceseeking.com.au/leads" style="
                                                text-align: left;
                                                text-decoration: none;
                                                font-weight: 300;
                                                font-size: 14px;
                                                line-height: 14px;
                                                color: white;
                                                height: auto;
                                                position: relative;
                                                padding: 21px 21px 16px 0;
                                                display: block;">Leads 

                                            <span class="notifications" style="
                                              background-color: tomato;
                                              font-size: 11px;
                                              font-weight: bold;
                                              line-height: 11px;
                                              color: white;
                                              text-align: center;
                                              padding: 4px 6px;
                                              margin-left: 8px;
                                              border-radius: 4px;">
                                              16</a>
                                          </td>
                                          <td>
                                            <a href="http://www.serviceseeking.com.au/quotes" style="
                                              text-align: left;
                                              text-decoration: none;
                                              font-weight: 300;
                                              font-size: 14px;
                                              line-height: 14px;
                                              color: white;
                                              height: auto;
                                              position: relative;
                                              padding: 21px 21px 16px 0;
                                              display: block;">Quotes
                                            </a>                                           
                                          </td>
                                          <td>
                                            <a href="http://www.serviceseeking.com.au/job_payments" style="
                                              text-align: left;
                                              text-decoration: none;
                                              font-weight: 300;
                                              font-size: 14px;
                                              line-height: 14px;
                                              color: white;
                                              height: auto;
                                              position: relative;
                                              padding: 21px 21px 16px 0;
                                              display: block;">Payments &amp; Invoices
                                            </a>                                            
                                          </td>
                                        </tr>
                                      </table> 
                                      </div>                                        
                                    </td>
                                  </tr>
                                </tbody>
                              </table>
                            </td>
                          </tr>
                        </tbody>
                      </table>
                    </td>
                  </tr>
                </tbody>
              </table>

  <!--================================================= Template ends here =================================================-->


</body>
</html>