Embedding Zoho doc changes format of website

When I try to embed a Zoho document using the <script src=""></script> code, the formatting on the rest of my website goes screwy- fonts and spacings change, eg. Removing the script snippet of code results in the website looking as it should. My document contains only one test link. I've never had this problem using the <iframe src=""></iframe> code from Google, but Google Docs no longer allows you to edit HTML, so I jumped shipped to Zoho.

Any help really appreciated!