$(function(){

  $main_box = $('#main-box');
  $kuku_box = $('#kuku-box');

  let main_w = $main_box.innerWidth();
  let main_h = $main_box.innerHeight();

  let kuku_w = $kuku_box.innerWidth();
  let kuku_h = $kuku_box.innerHeight();

  let ratio_w = kuku_w / main_w;
  let ratio_h = kuku_h / main_h;

  console.log(ratio_w, kuku_w, main_w);
  console.log(ratio_h, kuku_h, main_h);

  
  $kuku_box.css('transform', 'scale(' + ratio_w + ')');

});

$(window).on('load resize', function() {

});