JSFiddle - React, Tailwind, and code Playground

HTML

<div>hello world!</div>

CSS

div {
    font-size: 12px;
    height: 50px;
    width: 50px;
    overflow: hidden;
    color: #fff;
}
div:second-letter { 
    font-size: 18px; 
    line-height: 50px;
    border-radius: 50px;
    padding: 10px 17px;
    border: 1px solid #ccc;
    color: #000;
}