JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div class="container">
<div class="nav_wrapper"></div>
<div class="resposive-page"></div>
</div>
</body>

CSS

body{
  margin:0px;
  padding:0px;

  background-color: #FFCC00;
}

.nav_wrapper{
  width:18%;
height:50px;
float:left;
  background-color:cornflowerblue;
}

.resposive-page{
  width:82%;
height:50px;
  display:block;
  float:right;
  background-color:deeppink;
}