<html>
<head>
<style>
 
#one{width: 200px;}
#two{width: 300px;} 
img{max-width: 100%;}
</style>

</head>
<body>
<h3> 1. div width:200px, img width: 609px </h3>
<div id="one">
<img src="flower.png">
</div>
<h3> 2. div width:300px, img width: 609px </h3>
<div id="two">
<img src="flower.png">
</div>
</body>
</html>