When embedding Google docs, slides, sheets, etc, just 'Publish the doc to the web' under the File menu, click embed, and then copy the embed code.
It should look something like this:
<iframe src="https://docs.google.com/document/d/e/2PACX-1vQ5NxxuyduUhLZYHbdrjE_vsDVDA1GDSmXsjs7UelbJanDHRbRxuVpYoLP-DzthvoA3zOgjOebw5gxm/pub?embedded=true"></iframe>
If it doesn't fit your page correctly you can change the width and height, by specifying the desired width and height, after the iframe tag.
e.g.
<iframe width='100%' height='1500' src="https://docs.google.com/document/d/e/2PACX-1vQ5NxxuyduUhLZYHbdrjE_vsDVDA1GDSmXsjs7UelbJanDHRbRxuVpYoLP-DzthvoA3zOgjOebw5gxm/pub?embedded=true"></iframe>