JSFiddle - React, Tailwind, and code Playground

HTML

<div class="blockmenu">
<ul>
    <li><a href="#!">item 1</a></li>
    <li><a href="#!">item 2</a></li>
	<li><a href="#!">item 3</a></li>
	<li><a href="#!">item 4</a></li>
	<li><a href="#!">item 5</a></li>
</ul>
</div>

CSS

.blockmenu ul {
	padding: 0px !important;
	margin: 0px !important;
}

.blockmenu li {
	padding: 0px !important;
	margin: 0px !important;
	list-style: none;
	list-style-position: inside;
	display: block;
    position: relative;
    width: 25%; 
    float: left;
}

.blockmenu li a { 
       height: 150px;
       margin: 10px;
       display: block;
       text-align: center;
       color: #fff;
    line-height:150px;
} 

.blockmenu li:nth-child(3n-2) a {
      background: #e31937;
}
.blockmenu li:nth-child(3n-1) a {
      background: #002f5f;
}
.blockmenu li:nth-child(3n) a {
      background: #dcdcdd;
      color: #58595b;
}