Transparent background on custom weather card

Configuration
1

II am using the custom-weather card as an element of a picture-elements card
as shown here

image
image1371×831 193 KB

I would like the weather card background to be transparent.
Have nbeen playing with tons of style: options to no avail

    cards: 
      - type: picture-elements
        image: /local/img/sunset8.png
        elements:
          - type: image
            image: /local/img/SketchLiving2e.png
            style:
              top: 65%
              left: 57%
              width: 70%
              height: 100%

          - type: custom:weather-card  
            entity: xxxxx            
            name: xxxxx
            details: false
            hourly_forecast: false  
            style:

but cannot get the blue background to go.
Any help is appreciated.
Erik