JSFiddle - React, Tailwind, and code Playground

HTML

<p>
    A paragraph
</p>

CSS

* {
    box-sizing: content-box;
}

p {
    position: relative;
    width: 200px;
    border: 10px solid rgba(255, 0, 0, 0.5);
}

p::after {
    position: absolute;
    right: -100px;
    top: -10px;
    width: 100px;
    height: 30px;
    border: 10px solid rgba(0, 0, 255, 0.5);
    content: '';
}