<html>
<head>
<style>
.video-container{position:relative;padding-bottom:56.25%;padding-top:30px;height:0;overflow:hidden;}
.video-container iframe,.video-container object,.video-container embed{position:absolute;top:0;left:0;width:100%;height:100%;}
</style>
</head>
<body>
<h1>테스트 페이지</h1>
<div class="video-container">
<iframe width="100%" src="https://www.youtube.com/embed/HkMNOlYcpHg" frameborder="0" allowfullscreen></iframe>
</div>
</body>
</html>