JSFiddle - React, Tailwind, and code Playground

HTML

<div id="outer">
    <div id="first">&nbsp;</div>
    <div id="second">&nbsp;</div>
    <div id="third">&nbsp;</div>
</div>

CSS

#outer {
    width: 200px;
}

#first {
    width: 50%;
    height: 20px;
    background-color: red;
}

#second {
    width: 50.5%;
    height: 20px;
    background-color:green;
}

#third {
    width: 51%;
    height: 20px;
    background-color:blue;