Setting the Video Size
<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
<style>
video {
background-color: lightgrey;
border: medium double black;
}
</style>
</head>
<body>
<video src="yourVideo.webm" controls preload="auto" width="600"
height="240"> Video cannot be displayed
</video>
</body>
</html>