JSFiddle - React, Tailwind, and code Playground

HTML

<div>

</div>

CSS

div{
  position:relative;
  left:20%;
  height:250px;
  width:150px;
  border:1px solid #000;
  top:10%;
  background:#fff;
}
div:before, div:after{
  position:absolute;
  content:'';
  width:30px;
  height:30px;
  left:-12px;
  background:#fff;
  top:30px;
-ms-transform: rotate(45deg); /* IE 9 */
    -webkit-transform: rotate(45deg); /* Chrome, Safari, Opera */
    transform: rotate(45deg);
    
    border-radius:5px;
}
div:after{
  left:-13px;
  border-right-color:#000;
  z-index:-1;
  border:1px solid #000;
  top:29px;
  box-shadow: 0px 1px 6px 0px #282828;
}