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Hướng dẫn viết bài

<div class="tabber"> <div class="tabbertab section" id="tab1"> <h2>tieu de 1</h2> Noi dung tieu de 1 </div> <div class="clear"> </div> <div class="tabbertab section" id="tab2"> <h2 class="title">Tieu de 2</h2> Noi dung tieu de 2</div> <div class="clear"> </div> <div class="tabbertab section" id="tab4"> <h2 cla