@media (max-width: 768px) {
  .header h1{
    font-size: 32px;
  }
    .header .subtitle{
        font-size: 16px;
        text-align: center;
    }

    .card-header{
        font-size: 16px;
    }

    .code-grid{
        flex-direction: column;
        align-items: center;
    }

    .code-card{
        width: 100%;
    }

    .form-group .btn-magic{
        font-size: 16px;
    }
}