JSFiddle - React, Tailwind, and code Playground

HTML

<div class="common">
    <p>Content</p>
</div>

CSS

left: -5px;
    
}
.common::after {
    width: 5px;
    top: 5x;
    bottom: 5px;
    background: green;
    right: -5px;
    top: 5px;
}