body{
  background-color: #c0d3cf;
}

#calculator {
    width: 400px;
    height: 570px;
    margin: 100px auto;
    background-color: #797373;
    color: #fff;
    border-radius: 10px;
    border-radius: 20px;
    box-shadow: 10px 10px 15px .1px black;
  }

  .display {
    width: 100%;
    height: 80px;
    background-color: #4e5a49;
    font-size: 36px;
    text-align: right;
    padding: 20px;
    box-sizing: border-box;
   border-top-right-radius: 20px;
   border-top-left-radius: 20px;
   font-weight: bolder;
   font-family: cursive;
  }

  .buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 20px;
    padding: 20px;
  }

  button {
    width: 100%;
    height: 70px;
    font-size: 24px;
    background-color: #fff;
    color: #333;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    filter: drop-shadow(10px 10px 10px rgb(19, 24, 19));
    font-weight: bolder;
  }
  button:hover{
    transform: scale(1.05);
  }

  .operator {
    background-color: #f39c12;
    color: #fff;
  }