Google Sites integration with Elfsight widgets could be improved at least with the Social Share Buttons. This is due "because the widget is installed in an iframe due to Google Sites CMS's peculiarities".
The two issues that need to be fixed with Social Share Buttons if possible are:
1) The Social Share Buttons only work as "Inline" buttons and do not work as "Floating" Buttons.
2) The Pinterest button works fine to save images from a web page except it does not work with Android phones. This should probably be considered a bug fix since the Elfsight Social Share Button widget does work with other platforms such as Chromeboxes with the Chrome OS and Chrome browser, where you can save pictures to your Pinterest account using this widget. It is possible that the Pinterest button does not work with other platforms (like iOS, tablets, etc.) that we did not test. We only know that the Pinterest button does not work with Android phones.