Xinhuanet is grey, possibly because Jiang Zemin died

https://english.news.cn/20221130/4ec6705052f648ca8e4890025eb... (Jiang Zemin passes away)

https://en.wikipedia.org/wiki/Jiang_Zemin

If you look at the page source, you'll find a link to home_grey.css

Most apps are grey today. Taobao, alipay, meituan.