JSFiddle - React, Tailwind, and code Playground

HTML

<svg height="100" width="100" xmlns="http://www.w3.org/2000/svg">
    <circle cx="50" cy="50" r="50" />    
</svg>

<div></div>

CSS

svg {
    left: 50px;
    position: absolute;
    top: 50px;
}

svg circle {
    fill: green;
}

svg:before {
    border: 2px solid blue; 
    content: "";
    height: 100px;
    margin: -6px;
    padding: 4px;
    position: absolute;
    width: 100px;
    z-index: -1;
}

div {
    background-color: green;
    height: 100px;
    left: 200px;
    position: absolute;
    top: 150px;
    width: 100px;
}

div:before {
    border: 2px solid blue; 
    content: "";
    height: 100px;
    margin: -6px;
    padding: 4px;
    position: absolute;
    width: 100px;
    z-index: -1;
}