Background color after Novella revamp

After the renewal, the Novella wallpaper changed to white by default, but could you please add a function that allows me to decide on various background colors? The background color I used before was a little yellow, green, or whatever, and it was a toned-down color, so it was a little easier on my eyes even if I typed for a long time. It doesn't have to be the previous color, so could you please add a service that allows me to adjust it to a tone that is more comfortable for my eyes and set various settings so that I can write for a long time in various environments?