JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrap">
  <header></header>
  <div id="main"></div>
</div>

CSS

#wrap {
    width: 300px;
    margin: 20px auto;
    position: relative;
}

header, #main {
    background: #fff;
    
    border: 1px solid #211C18;
    border-radius: 5px;
    -moz-border-radius: 5px;
    -webkit-border-radius: 5px;    
    
    box-shadow: 2px 4px 20px #005377;
    -moz-box-shadow: 2px 4px 20px #005377;
    -webkit-box-shadow: 2px 4px 20px #005377;
}

header {
    display: block;
    width: 300px;
    height: 50px;
    
    position: relative;
    z-index: 2;
}

#main {
    width: 200px;
    height: 70px;
    
    position: absolute;
    z-index: 1;
    top: 40px;
    left: 50px;
}