@media screen and (max-width: 480px) {
  body {
    font-size: 14px;
  }

  .main-content {
    padding: 10px;
    margin: 0;
  }

  .header {
    flex-direction: column;
    align-items: center;
    margin: 10px;
    text-align: center;
  }

  .header h1 {
    font-size: 1.5rem;
    margin-bottom: 10px;
  }

  .timer {
    font-size: 1rem;
  }

  .three-main {
    flex-direction: column;
  }

  .question-container {
    width: 100%;
    padding: 15px;
    margin-right: 0;
    margin-bottom: 15px;
  }

  .question-grid {
    display: none;
  }

  .option {
    padding: 9px;
  }

  .nav-btn,
  .nav-btn-1 {
    padding: 8px 16px;
    font-size: 0.9rem;
  }

  .three-button {
    flex-direction: column;
    gap: 10px;
  }

  .navigation {
    width: 100%;
    justify-content: flex-start;
  }

  .prev-btn,
  .next-btn {
    margin-right: 10px;
  }

  .cancel-btn {
    width: 100%;
    margin-top: 10px;
  }
}