JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>
<div class="block"></div>

CSS

body {
/*     margin:0; */
    background-color: #333;
    width: 100%;
    margin: 0;
}
.block {
    float: left;
    width: 20%;
    height: 120px;
    background-color: #fff;
}
.block:nth-child(1) { background-color: red; }
.block:nth-child(2) { background-color: yellow; }
.block:nth-child(3) { background-color: lime; }
.block:nth-child(4) { background-color: cyan; }
.block:nth-child(5) { background-color: crimson; }
.block:nth-child(6) { background-color: green; }
.block:nth-child(7) { background-color: blue; }
.block:nth-child(8) { background-color: orange; }
.block:nth-child(9) { background-color: pink; }
.block:nth-child(10) { background-color: purple; }