JSFiddle - React, Tailwind, and code Playground

by Brodingo

HTML

<div class="x"></div>

CSS

.x {
    position: relative;
    overflow: hidden;
    border: 10px solid #fff;
    border-radius: 50%;
    box-shadow: inset 0 0 0 10px #444, 0 2px 4px rgba(0,0,0,.4);
}

.x:before,
.x:after {
    content: ' ';
    position: absolute;
    top: 10%;
    left: 0;
    width: 20%;
    height: 0;
    border-width: 40px;
    border-style: solid;
    border-color: transparent #444;
}

.x:after {
    top: 0;
    left: 10%;
    width: 0;
    height: 20%;
    border-color: #444 transparent;
}

div {
    width: 100px;
    height: 100px;
    margin: 20px;
    background: white;
}