* {
      margin: 0;
      padding: 0;
      box-sizing:border-box;
    }
    
 .calculator {
    width: 300px;
    margin: 50px auto;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  }

  #display {
    width: 100%;
    margin-bottom: 15px;
    padding: 10px;
    text-align: right;
  }

  .button {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }

  .clear {
    grid-column: 1 / -1;
    
  }