CSS

div#destaques{
    width: 400px;
    margin: auto;


}


div.post-destaques{
    width: 450px;
    padding-left: 15px;


}


section.sec-destaques{
    display: inline-block;
    width: 100%;
    margin-top: 30px;
    border-bottom: 1px solid #efeeee;
}