<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div class="container">
<img src="" />
</div>
<div class="container">
<img src="" />
</div>
<style>
img{
max-height: 100%;
max-width: 100%;
vertical-align: middle;
}
.container{
height: 500px;
width: 500px;
margin-top: 20px;
line-height: 498px;
text-align: center;
border: 1px solid #05a;
}
</style>
</body>
</html>
