1. Open the CAD software and click the new file in the upper left corner.
2. Find the oval tool on the left, as shown in the figure.
3. Draw a perfect circle, as shown in the figure.
4, do not fill any color, directly change the outline thickness, as shown in the figure.
5. You can see that the ring has appeared, as shown in the figure.
6. Select the ring, click on the arrangement above, and choose to convert the outline into an object, as shown in the figure.
7. Fill the ring with yellow to complete the production, as shown in the figure.