Mẫu thẻ div chia 2 cột viết bài và cột phải chèn quảng cáo

Xem link bài viết mẫu : http://www.goghep.xyz/2016/10/bang-chat-luong-go-ghep.html

<style>
.left {
float: left;
width: 70%;
}
.right {
float: right;
width: 30%;
}
.group:after {
content:"";
display: table;
clear: both;
}
img {
max-width: 100%;
height: auto;
}
@media screen and (max-width: 480px) {
.left,
.right {
float: none;
width: auto;
}
}
</style>
<br />
<div class="group">
<div class="left">
<!-- noi dung bai viet -->
Nội dung trái
<!-- ket thuc noi dung -->
</div>
<div class="right">
<div style="margin: 10px;">
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</a>
<br />
<center>
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</a>
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<center>
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</a>
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</a>
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<center>
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</div>
</div>
</div>