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

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.right {
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.group:after {
content:"";
display: table;
clear: both;
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img {
max-width: 100%;
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.left,
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float: none;
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<div class="group">
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Nội dung trái
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<div class="right">
<div style="margin: 10px;">
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