JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div class="block-1"></div>
<div class="block-2"></div>
</body>

CSS

body{
  padding: 0px;
  margin: 0px;
}
.block-1{
  width: 50px;
  height: 100px;
  border: 1px solid red;
}
.block-2{
  width: 100px;
  height: 50px;
  border: 1px solid black;
}