JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block1"></div>
<div class="block2"></div>

CSS

body {
  margin: 0;
}

.block1 {
  position: relative;
  z-index: 2;
  background: #fff;
  width: 80%;
  height: 300px;
  margin: 0 auto;
}

.block2 {
  position: relative;
  z-index: 1;
  background: #bca;
  height: 300px;
  margin: -100px 0 0;
}