JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="itemA">A</div>
    <div class="itemB">B</div>
    <div class="itemC">C</div>
<div>

CSS

.container{
    display: block;
    position:relative;
    width:200px;
    min-height:200px;
    background-color:black;
    overflow: hidden;
}
.itemA{
    position:absolute;
    top: 0;
    left: 0;
    background-color:red;
    width:30px;
    height:30px;
}
.itemB{
    display: block;
    position:absolute;
    top:50px;
    right:90px;
    background-color:green;
    width:30px;
    height:30px;
}
.itemC{
    display: block;
    position:absolute;
    bottom: 0;
    right:30px;
    background-color:blue;
    width:30px;
    height:30px;
}