Ok.. boh, ho provato a mettere su qualcosa, vedi se può andare bene.
codice:
<!DOCTYPE HTML>
<html>
<head>
<title>Esempio</title>
<meta charset="utf-8">
<style type="text/css">
.container {
position:relative;
width: 200px;
height: 150px;
}
.container>* {
position: absolute;
top: 0;
right: 0;
left: 0;
bottom: 0;
}
.container>div {
display: flex;
align-items: center;
justify-content: center;
text-align: center;
background: rgba(0,0,0,.3);
color: #fff;
font: bold 1rem/1 sans-serif;
}
.container>.image1 {
-webkit-transition: opacity 1.1s ease;
transition: opacity 1.1s ease;
}
.container:hover>.image1 {
opacity: 0;
}
</style>
</head>
<body>
<div class="container">
<img class="image2" src="http://images.freeimages.com/images/thumbs/a1b/poppy-2-1396348.jpg" alt="">
<div><p>Lorem ipsum dolor sit amet, consectetur adipisicing elit</p></div>
<img class="image1" src="http://images.freeimages.com/images/thumbs/be8/poppy-1406311.jpg" alt="">
</div>
</body>
</html>