JSFiddle - React, Tailwind, and code Playground

by Radiocity

HTML

<div class="header">менюшка</div>
<div class="wrapper">
	    <div class="lcol">Левая колонка</div>
	    <div class="rcol">Правая колонка</div> 
</div>

CSS

.header{
    height: 40px;
    background: green;
}
.lcol{
  float: left;
  width: 200px;
  background: grey;
}

.rcol{
    margin-left: 201px;
    background: orange;
}