JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bluebox">one</div>
<div class="redbox">two</div>

CSS

div {
    float:left;
    height:200px;
    width:100%;
    position: relative;
}
.bluebox{
    border: 2px solid #00f;
    z-index: 1;
}
.redbox{
    border: 2px solid #f00;
    left: -100px;
}