JSFiddle - React, Tailwind, and code Playground

HTML

<h2>Before letter-spacing is added:</h2>

<div class="parent">
    <p>Here is some text</p>
</div>

<h2>After letter-spacing is added:</h2>

<div class="parent">
    <p class="letterSpacing">Here is some text</p>
</div>

CSS

.parent {
    width: 80px;
    padding:10px;
    background-color:red;
}
.letterSpacing {
    letter-spacing: -1.5px;
}