<style><!--
#YQNum {
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  box-sizing: border-box;
  border: 2px solid #000000; /*Cor do campo de rastreio*/
  border-radius: 4px;
}

.button {
  display: inline-block;
  border-radius: 2px;
  background-color: #f4511e;
  border: none;
  color: #FFFFFF;
  text-align: center;
  font-size: 28px;
  padding: 20px;
  width: 200px;
  transition: all 0.5s;
  cursor: pointer;
  margin: 1px;
}

.button span {
  cursor: pointer;
  display: inline-block;
  position: relative;
  transition: 0.5s;
}

.button {
  background-color: #FB0303; /*Cor do botão*/
  border: none;
  color: White;
  padding: 15px 32px;
  text-align: center;
  text-decoration: bold;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
}
.button {width: 250px;}
--></style>
<div style="text-align: center;">Adicione abaixo o código de rastreio enviado em seu email!</div>
<br>
<div style="text-align: center;"><input maxlength="50" id="YQNum" type="text"> <input value="Rastrear" class="button" type="button" onclick="doTrack()"></div>
<div id="YQContainer"></div>
<script src="//www.17track.net/externalcall.js" type="text/javascript"></script> <script type="text/javascript">// <![CDATA[
function doTrack() {
    var num = document.getElementById("YQNum").value;
    if(num===""){
        alert("Por favor preencha o código de rastreio corretamente."); 
        return;
    }
    YQV5.trackSingle({
                YQ_ContainerId:"YQContainer",
                YQ_Height:560,
                YQ_Fc:"0",
                YQ_Lang:"pt",
                YQ_Num:num
    });
}
// ]]>
// ]]></script>