body {
      background-color: black;
      font-family: Arial;
    }
    .button {
      height: 60px;
      width: 60px;
      border-radius: 30px;
      font-size: 22px;
      border-color: transparent;
      padding: 6px 6px;
      margin-right: 5px;
      cursor: pointer;
    }
    .calculation {
      color: white;
      font-size: 45px;
      margin-bottom: 5px;
      margin-top: 25px;

    }
    .number {
      background-color: rgb(51,51,51);
      color: white;
    }
    .operation {
      background-color: rgb(254,160,10);
      color: white;
    }
    .clear {
      background-color: rgb(51,51,51);
      font-size: 18px;
      color: white
    }