JSFiddle - React, Tailwind, and code Playground

HTML

<div id="parent">
    <div id="child"></div>
</div>

CSS

#parent {
    width: 300px;
    height: 200px;
    background: #f90;
    position: relative;
}
#child {
    width: 20px;
    height: 20px;
    background: #fc0;
    position: absolute;
    -webkit-transform: translateX(calc(100% + 200px));
    -moz-transform: translateX(calc(100% + 200px));
    transform: translateX(calc(100% + 200px));
}