JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="item1">блок1</div>
	<div class="item2">блок2</div>
</div>

CSS

.container {
	width: 300px;
	height: 300px;
	border: 1px green solid;
	padding-left: 10px;
	padding-right: 10px;
}

.item1 {
	width: 66%;
	height: 100px;
	border: 1px black solid;
	background: orange;
}

.item2 {
	width: 66%;
	height: 100px;
	border: 1px black solid;
	margin-left: 34%;
	margin-top: 10px;	
	background: red;
}