body {
      font-family: Arial, sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      background-color: #ff5900;
    }
    
    .calculator {
      background-color: rgb(0, 0, 0);
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 0 10px rgb(43, 42, 42);
    }

    .display {
      width: 160px;
      height: 40px;
      text-align: left;
      margin-bottom: 10px;
      font-size: 1.5em;
      padding: 5px;
      background-color: #ffffff;
    }

    .buttons {
      display:grid;
      grid-template-columns: repeat(4, 40px);
      gap: 10px;
    }

    .buttons button {
      width: 40px;
      height: 40px;
      font-size: 1.2em;
      background-color: #ff0000;
      color: rgb(0, 0, 0);
      border-radius: 5px;
      cursor: pointer;
    }

    .buttons button:hover {
      background-color: #ff6600;
    }
    
    .buttons .equals {
      background-color: #84ff00;
    }

    .buttons .equals:hover {
      background-color: #ff6600;
    }