JSFiddle - React, Tailwind, and code Playground

HTML

<div class="div500"></div>
<div class="div498"></div>
<div class="div490"></div>

CSS

body {
    background: #666;
}
div {
    height: 50px;
}
.div500 {
    width: 50%;
    background: #fff;
}
.div498  {
    width: 49.8%;
    background: #f00;
}
.div490  {
    width: 49%;
    background: #00f;
}