<body>
<h2>Set the height and width of elements</h2>
<p>Original image:</p>
<img class="one" src="http://timoday.edu.vn/wp-content/uploads/2017/08/ocean.jpg" width="300" height="300"><br>
<p>Sized image (200x200 pixels):</p>
<img class="two" src="http://timoday.edu.vn/wp-content/uploads/2017/08/ocean.jpg" width="300" height="300"><br>
<p>The height and width of this div element is 300px:</p>
<div class="three"></div>
</body>
img.one {
height: auto;
}
img.two {
height: 200px;
width: 200px;
}
div.three {
height: 300px;
width: 300px;
background-color: powderblue;
}