Position of popup

Hi I have popups in my site generated by a script that I inherited (I know nothing about js.. )

I need to reposition the popup further down and to the left.

Could you tell me what I need to add to this, please?

(function() {
   'use strict';

function init(){
if (navigator.userAgent.indexOf('Edge') >= 0){ return; }
   var left=document.getElementById('left');
   var right=document.getElementById('right');
   var box4=document.getElementById('box4');
    var head=document.getElementById('head');
   var nav=document.getElementById('nav');
   var horizontal2=document.getElementById('horizontal2');
 var footer=document.getElementById('footer')
   var hgt=[left.offsetHeight,right.offsetHeight,box4.offsetHeight];
        hgt=(Math.max(hgt[0],hgt[1],hgt[2]));

   


if(window.name=='newwindow') {
if(document.getElementById('name')){
   document.getElementById('name').style.display='';
 }
   header.style.display='none';
   nav.style.display='none';
   horizontal2.style.display='none';
   left.style.display='none';
   right.style.display='none';
   footer.style.display='none';
   box4.style.width='820px';
document.getElementById('popup-test').innerHTML=
   '<h3><a href="#">Close<\/a><\/h3>'+
   '<h4><\/h4>'+
  '<h3><a href="Punta.php" target="top"><\/a><\/h3>';
var anc=document.getElementById('popup-test').getElementsByTagName('a');
for(var c=0;c<anc.length;c++) {
anc[c].onclick=function() {
   window.close();
   return false;
    }
   }
  }
 }

   window.addEventListener?
   window.addEventListener('load',init,false):
   window.attachEvent('onload',init);

})();