JSFiddle - React, Tailwind, and code Playground

HTML

<div id="infoBox">
Lorem Ipsum is simply dummy text.
Lorem Ipsum is simply dummy text.
<div style="position:absolute; border:1px solid green; left:-90px; height:50px;width:100px;background-color:red">
Tooltip
</div>
</div>

CSS

#infoBox {
  z-index: 1200;
  width:160px;
  height:90%;
  position: absolute;
  top: 10px;
  right: 10px;
     
	  background-color:white;
    overflow-y:auto; /* REMOVE THIS */
    border:1px solid red
    }