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

[dolodobendan]

It works like this:

type: entity
entity: input_boolean.style
style: |
  @keyframes rotation { 0% { transform: rotate(0deg); }
                      100% { transform: rotate(359deg); } }
  .header .icon {
  {% if is_state('input_boolean.style','on') %}
    animation: rotation 1.5s linear infinite;
  {% endif %}  
  }

You’re welcome.