.row {
      display: flex;
      margin: 10px;
    }
    .letter-input {
      width: 70px;
      height: 70px;
      font-size: 24px;
      text-align: center;
      margin: 0 5px;
    }
    .correct {
      box-shadow: 0 0 5px 2px green;
    }
    .incorrect {
      box-shadow: 0 0 5px 2px red;
    }
    .mar{
              width: 70px;
      height: 70px;
      font-size: 24px;
      text-align: center;
      margin: 0 5px;
    }