<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
* {
box-sizing: border-box;
}
.container {
position: relative;
width: 50%;
max-width: 300px;
}
.image {
display: block;
width: 100%;
height: auto;
}
.overlay {
position: absolute;
bottom: 0;
background: rgb(0, 0, 0);
background: rgba(0, 0, 0, 0.5);
color: #f1f1f1;
width: 100%;
transition: .7s ease;
opacity: 0;
color: white;
font-size: 20px;
padding: 20px;
text-align: center;
}
.container:hover .overlay {
opacity: 1;
}
</style>