body {
      margin: 0;
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      background: linear-gradient(to top, #c2b280, #a67c52);
      font-family: 'Comic Sans MS', cursive;
      overflow: hidden;
    }

    .calculator {
      background: #f0e6d2;
      padding: 20px;
      border: 4px solid #5c4033;
      border-radius: 12px;
      box-shadow: 6px 6px 0 #2e1f13;
      text-align: center;
      z-index: 2;
      position: relative;
    }

    h2 {
      margin-bottom: 15px;
      color: #5c4033;
    }

    #display {
      width: 220px;
      height: 40px;
      margin-bottom: 15px;
      border: 3px solid #5c4033;
      border-radius: 6px;
      text-align: right;
      padding: 5px;
      font-size: 1.2rem;
      background: #fff;
      color: #333;
    }

    .buttons {
      display: grid;
      grid-template-columns: repeat(4, 60px);
      gap: 10px;
      justify-content: center;
    }

    button {
      padding: 10px;
      font-size: 1.1rem;
      border-radius: 8px;
      border: none;
      cursor: pointer;
      background: #6b8e23;
      color: #fff;
      font-weight: bold;
      box-shadow: 3px 3px 0 #2e1f13;
      transition: transform 0.1s;
    }

    button:hover {
      transform: scale(1.1);
    }

    button:active {
      transform: scale(0.95);
    }
    footer{
    text-align: center;
    padding: 10px;
    background: linear-gradient(90deg, #0d3317, #042404);
    color: white;
    font-size: 14px;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

footer strong{
    color: #fff5fb;
}