anchor.diff:    });
   
     document.getElementsByClassName('close')[0].addEventListener('click', function(){
  +
       document.getElementById('modal-form').dataset.showup = 'false';
       setTimeout(function(){
         document.getElementById('modal-form').style.display = 'none';
  
positive.code:     document.getElementById('btn-back').addEventListener('click', function(){
        clickNumber -= 1;
        size_ = size_screen*clickNumber;
        // optimizar
        if (clickNumber < 1) {
          document.getElementById('btn-back').style.display = 'none';
  
negative.code: <script type="text/javascript">
   (function() {
    document.getElementById('close-video-tag').addEventListener('click', function(){
      /*
      if (window.innerWidth < 768) {
        document.getElementsByClassName('container-slider')[0].style.display = 'unset';
      }
      */
      document.getElementById("tag-video").pause();
      document.getElementsByClassName('video')[0].classList.add('hide');
      var child = document.getElementsByClassName("video")[0];
      child.parentNode.removeChild(child);
  
      //document.getElementsByTagName('body')[0].style.overflowY = 'unset';
  
    });
  
    document.getElementById('btn-register-form').addEventListener('click', function(){
  