<html>
<head>
<style>
/* Use a responsive layout for the PDF viewer */
.pdf-viewer {
width: 100%;
height: 0;
padding-bottom: 75%;
position: relative;
}
.pdf-viewer iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<!-- Embed the PDF file in the webpage -->
<div class="pdf-viewer">
<iframe src="path/to/mypdf.pdf"></iframe>
</div>
</body>
</html>