I give you an example for Adobe Illustrator, the home take message is that you should save your work in any editor as PNG file or any format that preserve transparency.



First of all you create one basic form without stroke and with any fill color you want -

![enter image description here][1]

![enter image description here][2]

and rotate-copy it 12 times for 30 degrees - 

![enter image description here][3]

now I invoked Export function and saved it as png file with transparent background -  it will be visible proprietary on any background you want:

![enter image description here][4]


  [1]: https://i.sstatic.net/6hiHG.png
  [2]: https://i.sstatic.net/FGVOf.png
  [3]: https://i.sstatic.net/zOPEE.png
  [4]: https://i.sstatic.net/kx7zH.png