var button = document.querySelector("#kt_referral_program_link_copy_btn");
 var input = document.querySelector("#kt_referral_link_input");
 var clipboard = new ClipboardJS(button);

 clipboard.on("success", function(e) {
 var buttonCaption = button.innerHTML;
 //Add bgcolor
 input.classList.add("bg-success");
 input.classList.add("text-inverse-success");

 button.innerHTML = "Copied!";

 setTimeout(function() {
 button.innerHTML = buttonCaption;

 // Remove bgcolor
 input.classList.remove("bg-success"); 
 input.classList.remove("text-inverse-success"); 
 }, 3000); // 3seconds

 e.clearSelection();
 });