function adjustModalHeight() {
  var mobileView = window.matchMedia("(max-width: 768px)");
  var element = document.querySelector('.modal.big-size');
  // exists and its a mobile?
  if (mobileView.matches && element) 
  { 
	
    var viewportHeight = window.innerHeight + 'px';
    element.style.height = viewportHeight;
    element.style.minHeight = viewportHeight;
    element.style.position = 'absolute';
    element.style.top = '0px';
    element.style.left = '0px';
    element.style.transform = 'none';
  }
}


adjustModalHeight();