main {
    margin: 3rem auto;
    max-width: 90vw;
    width: 50ch;
  }
  
  .letter {
    width: 30px;
    height: 30px;
    /* border-style: solid; */
    padding: 2px;
    margin: 2px;
    display: inline-block;
  }
  
  .letter-button {
    margin: 0.25rem;
    font-size: 1.25rem;
  }