JSFiddle - React, Tailwind, and code Playground

HTML

<div class='wrapp'>
  
</div>

<div class='nav'>

</div>

CSS

.wrapp {
  float: left;
  background: yellow;
  width: 70%;
  height: 100vh;
}

.nav {
  float: right;
  background: green;
  width: 55px;
  height: 100vh;
}