This Edge composition is fine, the way you are inserting in other html page matters.
Try the following steps:
1. Specify the height and width of the html container where you are putting the Edge stage div.
2. Set the position of Stage div's parent or container div to absolute.
For better results, make "Center Stage" for Stage in Edge Animate to "Both", then follow the above steps.
If still this doesn't resolve your issue, share the html page where you are inserting the Edge composition.
hope that helps,
Vivekuma