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HTML

<div id="main" style="position: fixed; top: 50%;  margin-top: -250px; left:0; height: 500px; width: 450px; background-color:red;">Main Content Div</div>
<div id="verticaldiv" style="overflow:hidden; position: fixed; left:350px; height:40px; width:200px; margin: auto; background-color:blue; text-align:center; color:white; -webkit-transform: rotate(90deg) translate(-50%, -50%); -moz-transform: rotate(90deg) translate(-50%, -50%); -ms-transform: rotate(90deg) translate(-50%, -50%); -o-transform: rotate(90deg) translate(-50%, -50%); transform: rotate(90deg) translate(-50%, -50%);">Side Tab</div>

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JSFiddle - React, Tailwind, and code Playground

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