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HTML

              
                .whatsapp
  a(class="fa fa-whatsapp" href="" target="_blank")
              
            
!

CSS

              
                .whatsapp
  width: 50px
  height: 50px
  margin: 0 auto
  text-align: center
  border: 3px solid green
  border-radius: 50%
  transition-duration: 0.5s
  .fa-whatsapp
    padding-top: 5px
    font-size: 40px
    text-decoration: none
    color: green

  &:hover
    background-color: green
    .fa-whatsapp
      color: white
              
            
!

JS

              
                function decorateWhatsAppLink() {
  //set up the url
  var url = 'whatsapp://send?text=';

  //define the message text
  var text = 'Hey check out this awesome blog at https://madole.xyz';

  //encode the text
  var encodedText = encodeURIComponent(text);

  //find the link
  var $whatsApp = $('.whatsapp a');

  //set the href attribute on the link
  $whatsApp.attr('href', url + encodedText);
}

//call the decorator function
decorateWhatsAppLink()
              
            
!
999px

Console