JSFiddle - React, Tailwind, and code Playground

HTML

<div class="cell-row">
    <div class="cell">
        <p>1</p>
        <p>test</p>
    </div>
    <div class="cell">
        <p>2</p>
    </div>
</div>

CSS

html, body
{
    margin: 0;
    height: 100%;
}

div.cell-row
{
    min-height: 150px;
    background: #111;
    
    font-size: 0;
}

div.cell-row div.cell
{
    display: inline-block;
    vertical-align: top;
    
    border-right: 1px solid #aaa;
    background: #ccc;
    
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    
    width: 50%;
    padding: 10px;
    height: 100%;
}

div.cell-row div.cell p
{
    font-size: 80px;
}