JSFiddle - React, Tailwind, and code Playground

HTML

<div id="end"></div>

CSS

#end {
    width: 150px;
    height: 150px;
}

/*Magic below*/












#end {
    position: relative;
    overflow: hidden;
}

#end:after {
    content: "";
    display: block;
    width: 0;
    height: 0;
    border: 9999px solid red;
    border-right-color: transparent;
    left: 50%;
    top: 50%;
    position: absolute;
    margin-top: -9999px;
    margin-left: -9999px;
}