Google Sites
Unfortunately, due to the way Google Sites is built, you can't install floating widgets. You can only install inline widgets that appear on specific pages.
How to add Widg.io widgets to your Google Sites website
1.
Log into your Google Sites account, open the website you want to update and click on < > Embed
2.
In the pop up window, click Embed Code. Copy both the Widg.io Element Script and the Installation Code, and paste into the box. Click Next when completed.
3.
Review the embedded code and then click Insert
The Widg.io widget has now been successfully added to the page.