JSFiddle - React, Tailwind, and code Playground

HTML

<pie class="twentyfive"></pie>

CSS

pie {
    width: 5em;
    height: 5em;
    /* display: block; */
    border-radius: 50%;
    background-color: blue;
    border: 2px solid green;
    /* float: right; */
    margin: 1em;
    position: fixed;
    top: 0;
    right:0;
}

.twentyfive {
    background-image:
        linear-gradient(360deg, transparent 50%, white 50%),
        linear-gradient(270deg, white 50%, transparent 50%);
}