JSFiddle - React, Tailwind, and code Playground

HTML

<p>
    <div class="a">A</div><div class="b">B</div>
</p>
<p>
    <div class="a"></div><div class="b">B</div>
</p>

CSS

.a {
    width:20px;
    height:20px;
    display:inline-block;
    background-color:red;
}
.b {
    background-color:orange;
    line-height:20px;
    font-size:12px;
    display:inline-block;
}