input.otp {
    background:#3b3b3b;
    border-radius:5px;
    border:1px solid black;
    width:2rem;
    text-align: center;
    color: white;
    font-size: 1rem;
    padding: 5px 0;
    margin-right: 0.5rem;
  }
  input.otp:focus
  {
      color:black;
  }
  #otp_wrapper{
    width:80%;
    display:block;
    margin:auto;
    text-align:center;
  }