JSFiddle - React, Tailwind, and code Playground

HTML

<div class="numberCircle">30</div>
<div class="numberCircle" style="font-size: 60px">1</div>
<div class="numberCircle" style="font-size: 12px">2</div>

CSS

.numberCircle {
    font: 32px Arial, sans-serif;

    width: 2em;
    height: 2em;
    box-sizing: initial;
    
    background: #fff;
    border: 0.1em solid #666;
    color: #666;
    text-align: center;
    border-radius: 50%;    
    
    line-height: 2em;
    box-sizing: content-box;   
}