How can I add a border radius to this button code?


  <!-- BUTTON -->
                                <tr>
                                    <td align="center" style="padding:10px 0;">
                                    <table border="0" cellpadding="0" cellspacing="0" class="deviceWidthPadding" style="width:610px;">
                                        <tbody>
                                            <tr>
                                                <td align="center" style="padding-top:0px;">
                                                <div class="animated infinite pulse">
                                                <table border="0" cellpadding="0" cellspacing="0" style="border-collapse:separate!important; background-color:#FCA039;">
                                                    <tbody>
                                                        <tr>
                                                            <td align="center" style="border:2px solid #FCA039;" valign="top"><!--[if gte mso 9]>
                                                    <table border="0" cellspacing="0" cellpadding="0" style="width:169px;">
                                                    <tr>
                                                    <td align="center" style="padding:11px 16px;" bgcolor="#FCA039" valign="top">
                                                    <![endif]--><a class="button" href="##CLICKTAG##2023##ArgDelimiter####ArgDelimiter####ArgDelimiter##http://www.thanedirect.co.uk/nano-gym/?utm_source=inbox&utm_medium=email&utm_campaign=##MAILING_NAME##" style="background-color: #FCA039; border-collapse: separate!important; border-top: 16px solid #FCA039; border-right: 16px solid #FCA039; border-bottom: 16px solid #FCA039; border-left: 16px solid #FCA039; color: #ffffff; display: inline-block; font-family: Helvetica, Arial, sans-serif, 'Nunito'; font-size: 16px; line-height: 19px; text-align: center; font-weight: bold; text-align: center; text-transform: none; text-decoration: none;" target="_blank">SHOP NOW</a> <!--[if gte mso 9]>
                                                    </td>
                                                    </tr>
                                                    </table>
                                                    <![endif]--></td>
                                                        </tr>
                                                    </tbody>
                                                </table>
                                                </div>
                                                </td>
                                            </tr>
                                        </tbody>
                                    </table>
                                    </td>
                                </tr>