NOTE: You can also use animated gif icons, you can try gify:
- Start by visiting https://icons8.com/
- Search for an icon and click it
- Click "Embed HTML"
- Copy the image URL in the src part of the snippet
- Paste the copied link into the Image input in ProveSource.
- Learn more about customizing the icon with icons8 URL formatting here: http://img.icons8.com/