<a href="https://wa.me/56987494555?text=Hola Radio Interamericana, quiero contactarme con ustedes." class="whatsapp" target="_blank"> <i class="fa fa-whatsapp whatsapp-icon"></i></a>

<style>
  .whatsapp {
  position:fixed;
  width:60px;
  height:60px;
  bottom:100px;
  right:40px;
  background-color:#25d366;
  color:#FFF;
  border-radius:50px;
  text-align:center;
  font-size:30px;
  z-index:100;
}

.whatsapp-icon {
  margin-top:13px;
}
</style>

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">

Whatsapp Bottom Fixed

Header

Anuncio Header

Etiqueta

Footer

Menú lateral

Menú

Búsqueda

<script type="application/javascript" src="https://ced.sascdn.com/tag/3981/smart.js" async></script>
<script type="text/javascript" src="https://tagmanager.smartadserver.com/3981/522246/smart.prebid.js" async></script>
<script type="application/javascript">
    var sas = sas || {};
    sas.cmd = sas.cmd || [];
    sas.cmd.push(function() {
        sas.setup({ networkid: 3981, domain: "https://www15.smartadserver.com", async: true, renderMode: 2 });
    });
    sas.cmd.push(function() {
        sas.call("onecall", {
            siteId: 522246,
            pageId: 1632256,
            formats: [
                 { id: 99069, tagId: "300x250-A" }
,{ id: 99074 }
,{ id: 99084 }
,{ id: 99435, tagId: "Inread" }
            ],
            target: ''
        });
    });
</script>

<div id="sas_99084"></div>
<script type="application/javascript">
    sas.cmd.push(function() {
        sas.render("99084");  // Formato : ITT 1x1
    });
</script>

<div id="sas_99074"></div>
<script type="application/javascript">
    sas.cmd.push(function() {
        sas.render("99074");  // Formato : Sticky Footer
    });
</script>

Tohá elogia renuncia de Vodanovic (PS)