* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    text-align: center;
    font-family: Arial, sans-serif;
    background-color: white;
    padding-bottom: 4rem;
    color: #333;
  }
  
  h1 {
    font-size: 2rem;
    margin-top: 1rem;
  }
  
  h2 {
    font-size: 1.2rem;
    margin: 1rem;
  }
  
  .instructions {
    font-size: 1rem;
    margin: 1rem auto;
    max-width: 300px;
  }
  
  .btn-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    justify-items: center;
    margin: 2rem auto;
    max-width: 400px;
    padding: 0 1rem;
  }
  
  .btn {
    width: 140px;
    height: 140px;
    border-radius: 20%;
    border: 8px solid black;
    transition: transform 0.2s;
  }
  
  .btn:active {
    transform: scale(0.95);
    opacity: 0.9;
  }
  
  .red {
    background-color: #EF476F;
  }
  .orange {
    background-color: #FFD166;
  }
  .green {
    background-color: #06D6A0;
  }
  .blue {
    background-color: #26547C;
  }
  
  .btn-flash {
    background-color: white !important;
  }
  
  footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3rem;
    background-color: #2c3e50;
    color: #ecf0f1;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  @media (max-width: 480px) {
    h1 {
      font-size: 1.5rem;
    }
  
    h2 {
      font-size: 1rem;
    }
  
    .btn {
      width: 90px;
      height: 90px;
      border-width: 6px;
    }
  
    .instructions {
      font-size: 0.9rem;
    }
  }