body {
    background-color: #ffffff;
    color: #fff;
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
  }

  .home {
    position: fixed;
    top: 20px;
    left: 20px;
    background-color: #ff5f1f;
    border: none;
    color: #fff;
    font-size: 24px;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 6px;
    z-index: 2;
    box-shadow: 3px 0 15px rgba(0, 0, 0, 0.4); 
  }
  
  .calculator {
    background-color: #FF5F1F;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 0 20px rgba(255, 165, 0, 0.4);
    width: 320px;
  }
  
  .display {
    width: 100%;
    height: 60px;
    font-size: 2rem;
    text-align: center;
    padding: px;
    border: none;
    border-radius: 8px;
    margin-bottom: 20px;
    background-color: #2E2E2E;
    color: #fff;
  }
  
  .buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
  }
  
  .btn {
    padding: 20px;
    font-size: 1.2rem;
    border: none;
    border-radius: 8px;
    background-color: #2E2E2E;
    color: #fff;
    cursor: pointer;
    transition: background 0.2s ease;
  }
  
  .btn:hover {
    background-color: #1C1C1C;
  }
  
  .equal {
    background-color: #FFD300;
    grid-row: span 2;
  }
  
  .equal:hover {
    background-color: #2E2E2E;
  }
  
  .zero {
    grid-column: span 2;
  }