<a href="https://api.whatsapp.com/send/?phone=908503091420&text=Merhaba,%20makale%20botu%20hizmetiniz%20hakk%C4%B1nda%20bilgi%20almak%20istiyorum&type=phone_number&app_absent=0" class="float" target="_blank">
<i class="fa fa-whatsapp my-float"></i>
</a>
    
    <style>
    .float{
    position:fixed;
    width:60px;
    z-index:99999999999999;
    height:60px;
    bottom:20px;
    right:20px;
    background-color:#25d366;
    color:#FFF;
    border-radius:50px;
    text-align:center;
  font-size:30px;
    box-shadow: 2px 2px 3px #999;
  
}

.my-float{
    margin-top:16px;
}
    </style>