JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
<li class="block2"></li>
<ul class="posts first">
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
</ul>
<ul class="posts second">
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
<li class="block"></li>
</ul>
</div>

CSS

container{
	width:940px;
	margin: 0 auto;
	padding:40px;
	background:grey;
}
.container:after {
    content: "";
    display: table;
    clear: both;
}
.block{
	float:left;
	border:1px solid #ccc;
	width:216px;
	height:186px;
	margin: 0 0 20px 22px;
	list-style: none;
}
.block2{
	float:right;
	border:1px solid #fff;
	clear:both;
	width:217px;
	height:603px;
	list-style:none;
}
.posts{
	margin: 0;
	padding: 0;
}
.first .block:nth-child(3n+1){
	margin-left:0px;
	clear:left;
}
.second .block:nth-child(4n+1){
	margin-left:0px;
	clear:left;
}