JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
    <div class="item">
        <p>Sup?</p>
    </div>
    <div class="item">
        <p>Sup?</p>
        <p>Wish that other guy was the same height as me</p>
    </div>
</div>

CSS

.item {
    background: rgba(0,0,0,0.1);
    -webkit-box-flex: 1;
    -moz-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
}

.row {
    border: 1px solid red;
    display: -webkit-box;
    display: -moz-box;
    display: -webkit-flexbox;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
}