Who designed the stars with green code?

Both health code and travel code were invented by Ma Xiaodong.

Most people's communication big data travel cards and health codes are green, that is, they were in a relatively safe environment in the past 14 days. Besides the green card, there are yellow Kaka, orange card and red card. There is a little star now.

The name of the city is marked with an asterisk, which means that there are medium or high-risk areas in the city you have been to in the past 14 days, but this does not mean that you have actually been to these medium or high-risk areas.