If you are placing a new 1Weather widget, you can customize these features from the widget settings that pop up immediately.
You can change the accent color of the widget to a few pre-set colors. Or you can select the color picker to select any color of your choice to make your widgets beautiful.
The widgets also offer customizable background colors/themes. You may choose between light, dark, live weather, and transparent color/theme. Note that some of these widgets allow you to choose only a few from these background color/theme options.