Image hover Flip Flap Style

<!DOCTYPE html>
<html>
<head>
	<title>IMAGE HOVER FLIP FLAP STYLE | par NGLESSON</title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<meta name="keyword" content="IMAGE HOVER FLIP FLAP STYLE">
	<meta name="author" content="Mezgani said">
	<meta name="copyright" content="NGLESSON">
	<meta name="robots" content="index,follow">
	<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet">
	<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" type="text/css">
	<link href="style.css" rel="stylesheet" type="text/css">	
</head>
<body class="container">
<div class="row mt-5">	
	<ul id="portfolio">
		<a href="#">
		<li class="projet">
		  <div class="thumb">
			<img class="img-thumb" alt="" title="" src="../../assets/imgs/all/apprendre-nglesson.jpg" />
		  </div>
		  <h3 class="titre">Hover me</h3>
		</li>
		</a>
		<a href="#">
		<li class="projet">
		  <div class="thumb">
			<img class="img-thumb" alt="" title="" src="../../assets/imgs/all/apprendre-nglesson.jpg" />
		  </div>
		  <h3 class="titre">Hover me</h3>
		</li>
		</a>
		<a href="#">
		<li class="projet">
		  <div class="thumb">
			<img class="img-thumb" alt="" title="" src="../../assets/imgs/all/apprendre-nglesson.jpg" />
		  </div>
		  <h3 class="titre">Hover me</h3>
		</li>
		</a>
		<a href="#">
		<li class="projet">
		  <div class="thumb">
			<img class="img-thumb" alt="" title="" src="../../assets/imgs/all/apprendre-nglesson.jpg" />
		  </div>
		  <h3 class="titre">Hover me</h3>
		</li>
		</a>
	</ul>			
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>                       
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>   
</body>
</html>
li{
  list-style-type:none;
}
a{
	margin-left:20px;
	display:inline-block;
    width:240px;
	height:240px;
	text-decoration:none !important;
}
ul a li h3{
	font-family:georgia;
	color:white;
	display: table-cell;
	font-size: 30px;
	font-weight: lighter;
	height: 200px;
	line-height: 1em;
	text-align: center;
	vertical-align: middle;
	width: 240px;
	padding:20px;
	background-color:#CCC;
	border-radius:20px;
}
.thumb{
	height: 240px;
	position: absolute;
	width: 240px;
}
li:hover .thumb img{
	display: none;
}
.img-thumb{
	height: 240px !important;
	width: 240px !important;
	border-radius:20px;
}

                                    
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