@Suty I didn't try it in another browser. But I reopened it now and it's back to normal. Thanks!

@Ondřej-Šutera it's a Xiaomi Mi 8, after reading your answer, I remembered that I always leave my devices in dark mode, and luckily my smartphone has the option of not using dark mode in some apps. I unchecked the Windy option and it went back to normal. Thank you very much!