JSFiddle - React, Tailwind, and code Playground

HTML

<div class="post lastpost"></div>
<div class="columns">
    <div class="post"></div>
    <div class="post"></div>
    <div class="post"></div>
    <div class="post"></div>
    <div class="post"></div>
    <div class="post"></div>
    <div class="post"></div>
    <div class="post"></div>
</div>

CSS

.columns {
    width: 100%;
    -webkit-column-count: 4;
    -moz-column-count: 4;
}

.lastpost {
    width: 50% !important;
}

.post {
    width: 100%;
    height: 150px;
    background-color: #ccc;
    margin-bottom: 15px;
}