JSFiddle - React, Tailwind, and code Playground
HTML
<div id="this"><p>jdjdddsijiud jiduj dsiudjidujdsiu dsidsujd siudsjid udidsuj sdiusdj idsu jdsiu sdjis dujsiu djisdu sdiusj</p></div><div id="that">some text</div>
CSS
#that {height:100px;width:50px;border-radius:.5em;box-shadow:0px 0px 10px rgba(0, 0, 0, 0.60);background-color:rgba(0,0,0,0.5);color:#eee;backdrop-filter: (10px);-webkit-backdrop-filter:blur(10px);padding:.5em;position:absolute;top:1em;left:1em;}
#this {height:150px;width:150px;background-color:#ff0000;overflow:auto;}