JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<form>
    <input class="inputs" type="text" pattern="[0-9]" maxlength="1">
    <input class="inputs" type="text" pattern="[0-9]" maxlength="1">
    <input class="inputs" type="text" pattern="[0-9]" maxlength="1">
    <input class="inputs" type="text" pattern="[0-9]" maxlength="1">
    <input class="inputs" type="text" pattern="[0-9]" maxlength="1">
    <input class="inputs" type="text" pattern="[0-9]" maxlength="1">
    <input class="inputs" type="text" pattern="[0-9]" maxlength="1">
    <input type="submit" value="submit">
</form>

CSS

form {
    display: table;
    margin: 100px auto;
    text-align: center;
}
input[type="text"] {
    background-color: transparent;
    border: none;
    border-bottom: 2px solid gray;
    display: inline-block;
    font-size: 20px;
    margin: 0 5px;
    width: 1.5rem;
    text-align: center;
}
input[type="submit"] {
    background-color: #00cc66;
    border: 0;
    color: #fff;
    margin-top: 20px;
    padding: 10px;
    width: 100%;
}

JavaScript

$('.inputs').keyup(function () {
    if (this.value.length == this.maxLength) {
      $(this).next('.inputs').focus();
    }
});