🔹 Card-mod - Add css styles to any lovelace card

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It is simply border-color: black; I added border:none to show that you can remove the border altogether.

type: custom:hourly-weather
entity: weather.forecast_home
card_mod:
   style: |
     ha-card {
       background: none!important;
       border-color: black; 
       border: none;
         }

It’s general practice to post your code using the community standards. See #11