JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content_wrap">
    <div class="an_post"></div>
    <div class="an_post"></div>
    <div class="an_post"></div>
    <div class="an_post"></div>
    <div class="an_post"></div>
    <div class="an_post"></div>
</div>

CSS

.an_post { width: 100%; border: 1px dashed #000; padding: 10px; margin: 10px; }

JavaScript

jQuery.each($('#content_wrap > .an_post'), function(i, el) {
     setTimeout(function(){$(el).fadeOut(400);}, i*1000);
});