text: const contact_stepper = () => {
      var currentTab = 0;
      showTab(currentTab);
      
      function showTab(n) {
          var x = document.getElementsByClassName("tab");
  
          if (n==0){
              x[0].style.display = "inline";
              x[1].style.display = "none";
          }else if (n==1){
              x[1].style.display = "inline";
              x[0].style.display = "none";
          }
          
          fixStepIndicator(n);
      }
  
      let boton = document.getElementById("send-button");
  
      boton.onclick = function nextTab() {
          var x = document.getElementsByClassName("tab");
          if(currentTab == 0 && !validateForm()){
              alert("Hay campos incompletos en el formulario!")
              return false;
          } 
  
          x[currentTab].style.display = "none";
          currentTab = currentTab + 1;
  
          showTab(currentTab);
      }
  
      function validateForm() {
          var x, y, i, valid = true;
          x = document.getElementsByTagName("tab");
  
          inp_nombres = document.getElementById("form-nombres");
          inp_apellidos = document.getElementById("form-apellidos");
          inp_fecha = document.getElementById("form-fecha");
          inp_ciudad = document.getElementById("inputState");
          inp_correo = document.getElementById("exampleInputEmail1");
  
          y= [inp_nombres, inp_apellidos, inp_fecha, inp_ciudad, inp_correo];
  
          for(i = 0 ; i < y.length; i++){
              if(y[i].value == "") {
                  y[i].classList.add("invalid");
                  valid = false;
              }else{
                  y[i].classList.remove("invalid");
              }
          }
  
          if (valid) {
              document.getElementsByClassName("step")[currentTab].className += " finish";
          }
          return valid;
      }
  
      function fixStepIndicator(n) {
          var i, x = document.getElementsByClassName("step");
          for(i = 0; i < x.length; i++) {
              x[i].className = x[i].className.replace(" active", "");
          }
          x[n].className += " active";
      }
  }
  
  contact_stepper();