JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">
    Hello World, this text won't be opaque anymore
</div>

CSS

body {
    background-color: green;
}

div#content{
    color:white;
    width:1150px;
    background-color: rgba(0,0,0,.65);
    margin:0 auto;
}