How do I change my home setting? Also I have windy installed as a widget on my iphone13 Home Screen. When I access windy through the widget it always opens the wind page. How can I change this to open the rain page? Thanks

I want to change the colour scheme on the rain overlay but it is not at all clear how to do this. I have changed the rgb numbers by editing the code but when I press save nothing changes. What am I doing wrong?