JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outerDiv">
    <div class="innerDiv"> My Vertical Div </div>
</div>

CSS

.outerDiv {
    display: inline-flex;
    height: 400px;
    background-color: red;
    color: white;
}

.innerDiv {
    margin: auto 5px;
    background-color: green;   
}