google chorme 拡張機能うまくHTML埋め込みができない

Twitterの中にHTMLを埋め込みたいと思っていますが、どうも最前面にでません（一部CSSが効いていない？）

manifest.json

json
1{
2    "name": "TWst",
3    "version": "0.1",
4    "manifest_version": 2,
5    "description": "TEst。",
6    "permissions": [
7        "tabs", "<all_urls>", "contextMenus"
8    ],
9    "icons": {
10        "16": "img/4466.jpg"
11    },
12    "content_scripts": [
13    	{
14		"matches": ["<all_urls>"],
15      		"js": [	"js/jquery.js",
16       		    	"js/Twitter.js","js/meercat.js"
17       		],
18                "css":["css/style2.css"],
19                "run_at": "document_end"
20       	}
21    ],
22    "background": "js/background.js"
23}

Twitter.js

js
1setup_btn();
2function setup_btn(){
3$(function(){
4
5  var h ='<div class="meerkat">'
6        + '<a href="#" class="close-meerkat">close</a>'
7        + '<a class="dont-show">二度と表示させない</a>'
8        + '<div class="adsense">'
9        + '<a href="http://px.a8.net/svt/ejp?a8mat=25ITDK+D3MEI+CO4+65ME9" target="_blank">'
10        + 'フォロー</a>'
11        + '<img border="0" width="1" height="1" src="http://www11.a8.net/0.gif?a8mat=25ITDK+D3MEI+CO4+65ME9" alt="">'
12        +  '</div>'
13        +  '</div>'
14  $('#sr-event-log').appendTo( h );
15});
16
17
18
19}
20

style2.css

css
1.code {margin-top: 25px;}
2.close-meerkat {
3  position: absolute;
4  display: block;
5  height: 18px;
6  width: 18px;
7  background: url('images/close-x.png') no-repeat 0 0;
8  cursor: pointer;
9  text-indent: -9000px;
10  z-index: 10;
11}
12.dont-show {
13  position: absolute;
14  display: block;
15  height: 18px;
16  width: 160px;
17  cursor: pointer;
18  z-index: 10;
19  color: #EC7700;
20}
21a.dont-show:hover {color:#FFF;}
22.adsense {z-index: 5;}
23.meerkat {
24  color: #FFF;
25  display: none;
26}
27.pos-bot .adsense {
28  width: 728px;
29  height: 90px;
30  position: absolute;
31  left: 50%;
32  margin-left: -364px;
33}
34.pos-bot .adsense {top: 20px;}
35.pos-bot .close-meerkat {right: 10px; top: 20px;}
36.pos-bot .dont-show {right: -10px; top: 100px;}
37.pos-bot .dont-show {top: 100px;}
38