JSFiddle - React, Tailwind, and code Playground

HTML

<div id="toster">
    <div class="xxx"></div>
</div>

CSS

#toster {
    width: 200px;
    height: 300px;
    background: darkred;
    position: relative;
}

#toster > .xxx {
    width: 200px;
    height: 400px;
    position: absolute;
    left: 200px;
    top: 0;
    background: orange;
}