body {
    font-family: Arial, sans-serif;
    padding: 20px;
    background: #f5f5f5;
  }
  
  form {
    background: white;
    padding: 20px;
    border-radius: 8px;
    max-width: 400px;
    margin: auto;
  }
  
  label {
    display: block;
    margin-top: 10px;
    font-weight: bold;
  }
  
  input {
    width: 100%;
    padding: 8px;
    margin-top: 4px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 4px;
  }
  
  input.invalid {
    border-color: red;
  }
  
  button {
    width: 100%;
    padding: 10px;
    margin-top: 20px;
    border: none;
    border-radius: 4px;
    background-color: grey;
    color: white;
    font-size: 16px;
    cursor: not-allowed;
    transition: background-color 0.3s ease;
  }
  
  button.enabled {
    background-color: green;
    cursor: pointer;
  }
  #optOutBtn.enabled {
    background-color: darkred;
  }
  button {
  background-color: lightgray;
  color: white;
  padding: 10px;
  border: none;
  margin-top: 10px;
  width: 100%;
  font-size: 16px;
  border-radius: 8px;
  cursor: not-allowed;
  opacity: 0.6;
  transition: all 0.3s ease;
}

button.enabled {
  background-color: green;
  cursor: pointer;
  opacity: 1;
}

#optOutBtn.enabled {
  background-color: darkred;
}