JSFiddle - React, Tailwind, and code Playground

HTML

<div class="Moji-DaiRedFuto">
<p>この文字を大きくて赤い太文字にします。</p>
</div>

CSS

.Moji-DaiRedFuto p {
font-size: 200%;
color: #ff0000;
font-weight: bold;
}