GiteaMailTemplates/themes/terra/mail/user/auth/register_notify.tmpl

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta name="x-apple-disable-message-reformatting" />

  <title>
    {{.locale.Tr "mail.register_notify.title" (.DisplayName|DotEscape) AppName}}
  </title>

  <style type="text/css">
    /* Base */
    body,.ExternalClass,.ReadMsgBody { background-color:#f5ede0 }
    .email-wrap { max-width:600px;margin:40px auto;font-family:Georgia,'Times New Roman',serif }

    /* Header */
    .email-logo { display:block;margin:0 auto 10px;border:0;outline:none }
    .email-brand { font-size:20px;font-weight:700;color:#fff;letter-spacing:1px;text-shadow:0 1px 2px #0000001a }
    .email-header { padding:0;background:linear-gradient(180deg,#c67b5c,#d4956e,#e8c4a8);height:100px;text-align:center;vertical-align:bottom }

    /* Card */
    .email-card { padding:28px 32px 24px;background:#fffdf9;color:#5c4030 }
    .email-heading { margin:0;font-size:22px;line-height:1.4;color:#3d2b1f;font-weight:700 }
    .email-text { margin:0 0 8px;font-size:15px;line-height:1.8;color:#6b5040 }
    .email-subtext { margin:0 0 24px;font-size:14px;line-height:1.8;color:#8c7a6e;font-style:italic }

    /* Divider */
    .email-divider { height:1px;background:#d4c4a8;margin:0 }

    /* Button */
    .email-btn-row { padding:0 32px 28px;text-align:center;background:#fffdf9 }
    .email-btn { display:inline-block;padding:14px 38px;font-size:15px;font-weight:600;color:#fff!important;text-decoration:none;background:#c67b5c;border-radius:24px;letter-spacing:0.3px }
    .email-btn-table { margin:0 0 28px }

    /* Fallback link */
    .email-link-box { border:1px solid #d4c4a8;background:#f5ede0;border-radius:8px }
    .email-link-label { margin:0 0 6px;font-size:12px;color:#8c7a6e;font-style:italic }
    .email-link-url { margin:0;font-size:12px;font-family:monospace;color:#5c4030;background:#fffdf9;padding:10px 12px;border:1px solid #d4c4a8;border-radius:6px;word-break:break-all }

    /* Footer */
    .email-footer { padding:20px 32px;text-align:center;border-top:1px solid #d4c4a8;background:#f5ede0 }
    .email-footer-text { margin:0;font-size:12px;color:#8c7a6e }
    .email-footer-link { color:#c67b5c;text-decoration:none;font-weight:600 }

    /* Typography utilities */
    .card-body h1,.card-body h2,.card-body h3,.card-body h4,.card-body h5,.card-body h6 { color:#3d2b1f!important }
    .card-body a,.card-body a:link,.card-body a:visited { color:#c67b5c!important;text-decoration:underline!important }
    .card-body a:hover,.card-body a:active { color:#a06040!important }
    .card-body li { color:#6b5040!important }

    /* Responsive */
    @media only screen and (max-width:480px) {
      .email-card { padding:20px 16px!important }
      .email-btn-row { padding:16px!important }
      .email-heading { font-size:18px!important }
    }
  </style>
</head>

<body style="margin:0;padding:0;background:#f5ede0;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%;">
  <center style="width:100%;table-layout:fixed;">
    <table width="100%" cellpadding="0" cellspacing="0" border="0" class="email-wrap">

      <!-- Floating Title -->
      <tr>
        <td class="email-header">

          <img src="{{AppUrl}}assets/img/favicon.png" alt="logo" width="28" height="28" class="email-logo" />
          <span class="email-brand">{{AppName}}</span>
          <div style="width:40px;height:3px;background:#fff;margin:8px auto 0;border-radius:2px;opacity:0.6;"></div>

        </td>
      </tr>

      <!-- Card -->
      <tr>
        <td class="email-card card-body">

          <p class="email-heading">
            {{.locale.Tr "mail.hi_user_x" (.DisplayName|DotEscape)}}
          </p>

        </td>
      </tr>
      <tr>
        <td class="email-card" style="padding-top:0;">

          <p class="email-text">
            {{.locale.Tr "mail.register_notify.text_1" AppName}}
          </p>

          <p class="email-text">
            {{.locale.Tr "mail.register_notify.text_2" .Username}}
          </p>

          <p class="email-subtext">
            {{$set_pwd_url := printf "%suser/forgot_password" AppUrl}}
            {{.locale.Tr "mail.register_notify.text_3" $set_pwd_url}}
          </p>

        </td>
      </tr>

      <!-- Divider -->
      <tr>
        <td class="email-divider"></td>
      </tr>

      <!-- Button & Link -->
      <tr>
        <td class="email-btn-row">

          <table border="0" cellpadding="0" cellspacing="0" width="100%" class="email-btn-table">
            <tr>
              <td align="center">
                <a href="{{AppUrl}}user/login" class="email-btn">{{.locale.Tr "mail.view_it_on" AppName}}</a>
              </td>
            </tr>
          </table>

          <table width="100%" cellpadding="0" cellspacing="0" border="0" class="email-link-box">
            <tr>
              <td style="padding:14px 16px;border-radius:8px;">
                <p class="email-link-label">{{.locale.Tr "mail.link_not_working_do_paste"}}</p>
                <p class="email-link-url">{{AppUrl}}user/login</p>
              </td>
            </tr>
          </table>

        </td>
      </tr>

      <!-- Footer -->
      <tr>
        <td class="email-footer">

          <p class="email-footer-text">
            &copy;
            <a href="{{AppUrl}}" class="email-footer-link">{{AppName}}</a>
          </p>

        </td>
      </tr>

    </table>
  </center>
</body>
</html>