JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.block1 {
  width: 100px;
  height: 100px;
  background: red;
}

.block2 {
  width: 80px;
  height: 80px;
  background: blue;
  margin-left: -10px;
}