@media (max-width: 768px) {

  header .container {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }

  nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .banner h1 {
    font-size: 26px;
  }

  .banner p {
    font-size: 16px;
  }

  .overlay {
    padding: 20px;
  }

  .cards {
    flex-direction: column;
  }

  .card {
    width: 100%;
  }

  .sobre h2,
  .sobre p {
    text-align: center;
    margin: auto;
  }

  .btn-app {
    width: 100%;
    margin-top: 15px;
  }
}