JSFiddle - React, Tailwind, and code Playground

HTML

<div class="width20">
   Div with width 20%
</div>
<div class="width60">
   Div with width 60%
</div>
<div class="width20">
   Div with width 20%
</div>

CSS

body {
margin:0;
padding:0;
}
.width20 {
float:left;
width:20%;
background:grey;
height:100vh;
}
.width60 {
float:left;
width:60%;
background:orange;
height:100vh;
}