JSFiddle - React, Tailwind, and code Playground

HTML

<h1>
    <span class="major">Major part</span>
    <span class="minor">Minor part</span>
</h1>

CSS

h1 span {
            display: block;
        }
        h1 span.major {
            font-size: 50px;
            font-weight: bold;
        }
        h1 span.minor {
            font-size: 30px;
            font-style: italic;
        }