Help Please - Lovelace Picture Element - Double border with card modder

Hi,

I am relatively new to Home Assistant and very new to Lovelace. I am trying to put some information over a picture background. It all works nicely except all of my elements get a double border:

The code I am using is:

 - title: Upstairs Floor plan
    panel: true
    cards:
      - type: picture-elements
        image: /local/black-background.jpeg?v=9
        elements:         
          - type: custom:card-modder
            card:    
              type: custom:simple-weather-card
              entity: weather.dark_sky
              name: at home
            style:
              top: 12%
              left: 67%
              background-color: rgba(50,50,50,0.3)
              background-size: 100% 100%
              border-radius: 20px
              color: "#999999"
              
          - type: custom:card-modder
            card:    
              type: "custom:atomic-calendar"
              title: ""
              entities:
                - entity: calendar.##Calendar1##
                - entity: calendar.##Calendar2##
              fullDayEventText: 'All day'
              untilText: 'Until'
              showColors: true
              maxDaysToShow: 1
              showLocation: true
              showMonth: true
              showCurrentEventLine: false
              dateColor: white
              dateSize: 90
              timeColor: white
              timeSize: 90
              titleColor: orange
              titleSize: 100
              locationIconColor: 'rgb(230, 124, 115)'
              locationLinkColor: white
              locationTextSize: 90
              dimFinishedEvents: true
              finishedEventOpacity: 0.6
              finishedEventFilter: 'grayscale(100%)'
              dayWrapperLineColor: white
              eventBarColor: blue
              showProgressBar: true
              progressBarColor: blue
            style:
              top: 45%
              left: 18%
              width: 50%
              background-color: rgba(50,50,50,0.3)
              background-size: 100% 100%
              border-radius: 20px
              color: "#999999"

If I hash out the line '“background-color: rgba(50,50,50,0.3)”` it removes the double border but I lose my colour scheme.

Does anyone have any experience of this kind of issue?

Many thanks