JSFiddle - React, Tailwind, and code Playground

HTML

<div id="block"></div>

CSS

body {
    padding: 50px;
}
#block {
    border: 2px solid #000;
    padding: 20px;
    position: relative;
}
#block:after {
    content: "45$";
    background: #fff;
    padding: 5px;
    position: absolute;
    top: 0px;
    right: 50px;    
    margin-top: -15px;
}