JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
    <div class="col">
        <div class="box">
            <h1>DD</h1>
        </div>
    </div>
    <div class="col">
        <div class="box"></div>
    </div>
</div>

CSS

.row {
    display: flex;
    margin: 10px;
}
.col {
    flex: 1;
}
.box {
    background-color: white;
    border: 2px solid red;
    width: 150px;
    height: 150px;
    margin: 0 auto;
}