JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test">
    <div id="inner1"></div>
    <span id="inner2"></span>
    <div id="inner3"></div>
</div>

CSS

div#test {
    width:300px;
    height:400px;
    position:relative;
    display:block;
    border:1px solid blue;
}
div#test div, div#test span {
    display:block;
    position:absolute;
    border:1px solid red;
}
div#inner1 {
    top:15px;
    left:15px;
    height:15px;
    width:15px;
}
span#inner2 {
    top:65px;
    left:65px;
    height:15px;
    width:15px;
}
div#inner3 {
    top:155px;
    left:155px;
    height:15px;
    width:15px;
}