JSFiddle - React, Tailwind, and code Playground

by Dyaa Eldin Moustafa

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.4/css/bootstrap.min.css">
<div class="box"></div>

CSS

.box{
   	position: relative;
	background: #2d2d2d;
    height:50px;
}

.box:before{
	top: 100%;
    margin-top:-25px;
    margin-left:-25px;
    -webkit-transform: rotate(45deg);
	left: 50%;
    width:50px;
    height:50px;
    background: inherit;
    content:"";
    position:absolute;
    display:block;
    border-radius:0 0 10px 0;
}