JSFiddle - React, Tailwind, and code Playground

HTML

<div>Here is the transparent</div>

CSS

body { 
    background: #87ceeb;
}

div {
    background: rgba(255,255,255,.5);
    margin: 50px; 
    padding: 40px;    
    -webkit-border-radius: 30px;
    -moz-border-radius: 30px;
    border-radius: 30px;
    height: 200px;
    
    -moz-box-shadow: 10px 10px 5px #666;
    -webkit-box-shadow: 10px 10px 5px #666;
    box-shadow: 10px 10px 5px #666;    
}