JSFiddle - React, Tailwind, and code Playground

HTML

<div class="example">abc</div>

<div class="aaa">
    <div class="example">abc</div>
</div>

CSS

.aaa .example {
    font-size: 20px;
    color:red;
}

.example {
    font-size: 14px !important;
    color:blue !important;
}