Borders are overlapped and in a different color

Checklist

[X] I updated the card to the latest version available
[X] I cleared the cache of my browser

Describe the bug The borders for the buttons are overlapped and showed in a different color.

Version of the card Version: v4.1.2-dev.1

To Reproduce This is the configuration I used:

          - type: "custom:button-card"
            template: card_light
            entity: light.bedroom_2
            variables:
              ulm_card_light_enable_slider: true
              ulm_card_light_enable_color: true
              ulm_card_light_force_background_color: true

Screenshots

custom-cards / button-card

Borders are overlapped and in a different color #777