JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
    <div class="inner">
        12345678901234567890
    </div>
</div>

CSS

div {
    border: 1px solid red;    
}

.outer {
    position: absolute;
    top: 0px;
    height: 300px;
    width: 30px;    
}

.inner {
    transform: translateX(-50%) translateY(-50%) rotate(90deg);
    margin-left: 10px;
    position: absolute;
    top: 50%;
    text-align: center;
}