html
This code creates an iframe that will load the url https://view.officeapps.live.com/op/embed.aspx?src={PATH TO YOUR FILE} into the frame. The iframe will have a width of 100% and a height of 650px.
<iframe src='https://view.officeapps.live.com/op/embed.aspx?src={PATH TO YOUR FILE}' width='100%' height='650px' frameborder='0'></iframe>