Looking to add a preloader to your website this Elite Dangerous game inspired loader might be just what you are looking for. It was designed by James Panter. It shows a hexagon split up into multiple triangles with a circular sweeping motion of light in it.
If you are having trouble with the pen, try the archived copy on GitHub
Elite Dangerous Preloader
See the Pen Elite Dangerous Inspired Loader – Pure CSS by James Panter (@jpanter) on CodePen.0