JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
<div id="content">
</div>
</div>

CSS

*{
    margin:0;
    padding:0;
}
html,body{
    height:100%;
    width:100%;
}


#container{
    width:100%;
    height:100%;
    background:gray;
    position:relative;
    display:block;
}
#content{
    height:50px;
    width:50px;
    bottom:20px;
    right:10%;
    background:red;
    position:absolute;
}