JSFiddle - React, Tailwind, and code Playground

HTML

<div id="page">
    <h2>+7 920 747 12 34</h2>
</div>

CSS

#page {
	width: 500px;
	padding: 50px;
	margin: 0 auto;
	background-color: #fff;
	border: 1px solid #333;
}
h2 {
	position: relative;
	width: 50%;
	font-size: 1.5em;
	font-weight: bold;
	padding: 6px 20px 6px 70px;
	margin: 30px 10px 10px -71px;
	color: #555;
	background-color: #999;
	text-shadow: 0px 1px 2px #bbb;
	-webkit-box-shadow: 0px 2px 4px #888;
	-moz-box-shadow: 0px 2px 4px #888;
	box-shadow: 0px 2px 4px #888;
}
h2:after {
	content: ' ';
	position: absolute;
	width: 0;
	height: 0;
	left: 0px;
	top: 100%;
	border-width: 5px 10px;
	border-style: solid;
	border-color: #666 #666 transparent transparent;
    transform: scale(0.9999);
}