After configuring the widget it’s now time to style it. Here some options depends upon the API you are using which here is the Open Weather.
So to style the widget under Open weather API go to the Style tab > Widget. Here you have options to style the complete widget from background color to width.
Next we have the options to style the location text under the Location tab.
Next we have the option for styling the temperature text under the Weather Temperature tab.
Then we have the option to style the weather condition text under the Weather Condition tab.