body {
    background: white;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    margin: 0;
    padding: 0;
  }
  
.calculator {
    width: 100%;
    max-width: 25rem;
    margin: 5rem auto;
    padding: 2rem;
    background: orangered;
    border-radius: 1rem;
    box-shadow: 0 4px 8px blue;
    text-align: center;
    -webkit-box-shadow: 0 0 6px blue;
     box-shadow: 0 0 6px blue;
  }
  
  .calculator input {
    width: 100%;
    margin-bottom: 2rem;
    padding: 10px;
    border-radius: 0rem;
    font-size: 30px;
    text-align: right;
    border: none;
    background-color: cyan;
  }
  
  .calculator button {
    width: 4rem;
    height: 4rem;
    margin: 5px;
    font-size: 24px;
    background-color: silver;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  .calculator button:hover {
    background-color: lime;
  }
  
  .calculator button:active {
    background-color: silver;
  }
  
  .buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }
  
  @media (max-width: 10rem) {
    .calculator {
      width: 100%;
    }
    
    .calculator input {
      font-size: 20rem;
    }
    
    .calculator button {
      width: 60rem;
      height: 60rem;
      font-size: 18rem;
    }
  }