[Bug]: Configuration Error for custom today card

[coasting24]

My Home Assistant Version

Core: 2026.4.0
Frontend: 20260325.5
UIX: 6.0.0

custom:today-card used in custom:button-card

Card_mod has been removed from system. While the following code works with a card_mod prefix it does not render with the uix prefix:

My UIX installation method

HACS

My lovelace configuration method

YAML

Include any yaml code here

              card_mod:
                style: |
                  .indicator {
                    width: 5px !important;
                  }
                  ha-card {
                    background-color: transparent;
                    padding: 0px;
                    font-size: 16px;
                    border: none;
                    text-align: left !important; 
                  }                        

Error messages from the browser console

card custom:today-card Ln: At path: uix -- Expected a value of type `never`, but received: `[object Object]`

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[dcapslock]

custom:today card uses strict validation of config. I have submitted a pr to update to allow uix.

In the meantime you can use card_mod key and that will be read by uix for styling.