JSFiddle - React, Tailwind, and code Playground

HTML

<div class="relative">
    <div class="yellow-div"></div>
    <div class="yellow-div"></div>
    <div class="absolute"></div>
</div>
<img src="http://s30.postimg.org/5xtox3b9d/example.png" />

CSS

.relative{
    position:relative;
}

.absolute {
    position:absolute;
    width: 40px;
    height: 100px;
    background: #000;
    z-index: 1;
    top:30px;
    left:0px;
}
.yellow-div {
    position:relative;
    width: 200px;
    height: 50px;
    background: yellow;
    margin-bottom:4px;
    z-index:0;
}