JSFiddle - React, Tailwind, and code Playground

HTML

<div class="aside-text-rotate-outer">
    <div class="aside-text-rotate-middle rotate">
        <div class="aside-text-rotate-inner">Centered?</div>
    </div>
</div>

CSS

.aside-text-rotate-outer {
    display: table;
    height: 300px;
}

.aside-text-rotate-middle {
    display: table-cell;
    vertical-align: middle;
}

.aside-text-rotate-inner {
    margin-left: auto;
    margin-right: auto;
    /* width: 16px; */
}


.rotate {
  -webkit-transform: rotate(-90deg);
  -ff-transform: rotate(-90deg);
  transform: rotate(-90deg);
  width: 16px;  /* transform: rotate() does not rotate the bounding box. */
}