How to create image overlay icon effect on hover with CSS?

Following is the code to produce image overlay icon effect on hover using CSS -

Example

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" 
integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
<style>
*{
   box-sizing: border-box;
}
.card-container {
   display: inline-block;
   position: relative;
   width: 50%;
}
img {
   opacity: 1;
   display: block;
   width: 100%;
   transition: .5s ease;
   backface-visibility: hidden;
}
.hoverText {
   position: absolute;
   top:0;
   height: 100%;
   transition: .5s ease;
   opacity: 0;
   width: 100%;
   text-align: center;
}
.card-container:hover .hoverText {
   opacity: 1;
}
.caption {
   background-color: rgb(18, 53, 131);
   color: white;
   font-size: 30px;
   padding-top:30%;
   border-radius: 6px;
   height: 100%;
   font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
   font-weight: bolder;
}
</style>
</head>
<body>
<h1>Image Overlay Icon Example</h1>
<div class="card-container">
<img src="https://i.picsum.photos/id/237/536/354.jpg">
<div class="hoverText">
<div class="caption">
<i style="font-size:150px" class="fa fa-paw" aria-hidden="true"></i>
</div>
</div>
</div>
</body>
</html>