JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
<style>
#main {
  width: 300px;
  height: 100px;
  border: 1px solid #c3c3c3;
  display: flex;
}

#main div:nth-of-type(1) {flex-grow: 1;flex-basis: 50%;}
#main div:nth-of-type(2) {flex-grow: 1;flex-basis: 0;}
#main div:nth-of-type(3) {flex-grow: 1;flex-basis: 0;}
</style>
</head>
<body>

<h1>The flex-grow Property</h1>

<div id="main">
  <div style="background-color:coral;"></div>
  <div style="background-color:lightblue;"></div>
  <div style="background-color:khaki;"></div>
</div>


</body>
</html>