JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
      <div class="post">1</div>
      <div class="post">2</div>
      <div class="post">3</div>
      <div class="post">4</div>
      <div class="post">5</div>
      <div class="post">6</div>
      <div class="post">7</div>
      <div class="post">8</div>
      <div class="post">9</div>
      <div class="post">10</div>
</div>

CSS

.post {
    background: #c00;
    width: 200px;
    height: 20px;
    margin: 2px;
    font: 13px sans-serif;
    color: #eee;
    padding: 5px
}

JavaScript

$(function(){
    $('.post').slice(5,$('.post').length).remove();
});