JSFiddle - React, Tailwind, and code Playground

HTML

<div>Hello</div>

CSS

div{
    width:100px;
    height:30px;
    -moz-box-shadow: 0 -1px 15px #80abc6;
    -webkit-box-shadow: 0 -1px 15px #80abc6;
    box-shadow: 0 -1px 15px #80abc6;
    margin:30px;
    position:absolute;
}
div:after{
    content:'';
    width:10px;
    height:30px;
    background:#fff;
    position:absolute;
    top:0;
    left:-10px;
}