JSFiddle - React, Tailwind, and code Playground

HTML

<span class="num">19</span><span class="den">45</span>

CSS

.num {
    font-size: 0.5em;
    vertical-align: super;
}
.den {
    font-size: 0.5em;
}
.den:before {
    content: '\2044';
    font-size: 2em;
}