JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="box">With <code>flex: 1</code> applied to both flex items, the available container space is evenly distributed among both. Each box takes 50% of the container. It doesn't matter how much content there is. The items will overflow vertically if necessary.</div>
    <div class="box">box 2</div>
</div>

<br>

<div class="container">
    <div class="box">With <code>flex: 1</code> applied to both flex items, the available container space is evenly distributed among both. Each box takes 50% of the container. It doesn't matter how much content there is. The items will overflow vertically if necessary.</div>
    <div class="box">box 2</div>
	<div class="box">box 3</div>
</div>

<br>

<div class="container">
    <div class="box">With <code>flex: 1</code> applied to both flex items, the available container space is evenly distributed among both. Each box takes 50% of the container. It doesn't matter how much content there is. The items will overflow vertically if necessary.</div>
    <div class="box">box 2</div>
	<div class="box">box 3</div>
	<div class="box">box 4</div>
</div>

CSS

.container {
    display: flex;
    border: 1px solid #ccc;
}

.box {
    flex: 1;
    background-color: lightgreen;
    border: 1px dashed black;
}