Change opacity of button

@mdline wrote:

Hello,

I want to change the opacity of button depending on boolean value, which can be changed by the checkbox.
But don’t work, please help.

  <button class="isActive ? me-button : ''" ion-item (click)="change()">
    {{ person.id}}
  </button>

  .me-button{
opacity: 0.5;
    }
  }

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