Attilion / Remove ad banner div (MangaSanctuary...)

// ==UserScript==
// @name        Remove ad banner div (MangaSanctuary...)
// @namespace   Attilion
// @description Remove background ad
// @include     http://www.*-sanctuary.com/*
// @version     1.1
// @grant       none
// @run-at      document-end
// ==/UserScript==

window.addEventListener('load', function() {
  setTimeout(function(){
		var div_collection = document.querySelectorAll('div[style*=background]');
    for (i = 0; i < div_collection.length - 1; i++){
      if (div_collection[i].style.backgroundImage !== ""){
        var background_ad = div_collection[i];
      }
    }
    var parent_div = background_ad.parentElement;
    parent_div.removeChild(background_ad);
		parent_div.querySelector('#hab').setAttribute('style', 'margin: -140px auto 0px');
		parent_div.setAttribute('style', 'background-image: none');
		parent_div.setAttribute('style', 'background-color: whitesmoke');
	}, 2000);
}, false);