body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
  }
  
  .calculator {
    text-align: center;
    align-items: center;
    
  }
  
  #display {
    width: 94%;
    height: 100px;
    margin-bottom: 10px;
    padding: 10px;
    font-size: 1.5em;
    background-color: black;
    color: white;
  }
  
  .buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    height: 350px;
    background-color: rgb(173, 138, 138);
    border-radius: 10px;;
  }
  
  button {
    padding: 16px;
    width: 80px;
    font-size: 1.5em;
    cursor: pointer;
    background-color: rgb(173, 138, 138);
    color: black;
    border-radius: 10px;
    border: none;
  }
  
  
  button:active {
    background-color: #eee;
  }