JSFiddle - React, Tailwind, and code Playground

HTML

<div class="button">
    <span class="number">1</span>
    <div class="letters">
        <span class="letter">a</span>
        <span class="letter">b</span>
        <span class="letter">c</span>
    </div>
</div>

<div class="button">
    <span class="number">2</span>
    <div class="letters">
        <span class="letter">d</span>
        <span class="letter">e</span>
        <span class="letter">f</span>
    </div>
</div>

<div class="button">
    <span class="number">3</span>
    <div class="letters">
        <span class="letter">g</span>
        <span class="letter">h</span>
        <span class="letter">i</span>
    </div>
</div>

CSS

.button {
    width: 100px;
    height: 80px;
    background-color: black;
    margin: 20px;
    display: inline-block;
}

.number {
    color: white;
    display: block;
    text-align: center;
    font-size: 24px;
    padding-top: 10px;
}

.letters {
    display: block;
    text-align: center;
    margin-top: 5px;
}

.letter {
    display: inline;
    padding: 0 5px;
    color: white;
}