Fidget Spinners has taken the world by storm and if you want you next loading icon to look like the iconic gizmo use the pure CSS snippet by Tomi Sjöblom. It shows a simple fidget spinner spinning in both directions.
If you are having trouble with the pen, try the archived copy on GitHub
Fidget Spinner Snippet
See the Pen Loading (fidget) spinner. by Tomi Sjöblom (@DHawku) on CodePen.0