JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
	<div class="child">Меню</div>
	<div class="child">
        Контент Lorem ipsum dolor sit amet, 
        consectetur adipisicing elit. Eveniet, 
        ipsa, modi nesciunt vel corporis optio 
        nemo. Saepe, unde, corporis voluptate 
        at laboriosam culpa eum modi assumenda 
        velit vitae. Cumque, consequuntur.
    </div>	
</div>

CSS

.wrap {
	border: 1px solid;
	background: yellow;
	display: flex;
	flex-wrap: wrap;
	max-width: 900px;
	margin: 0 auto;
}

.child {
	background: white;
	color: red;
	font-size: 20px;
	flex-basis: 100px;
	height: 50px;
	margin: 5px;
	height: 100%;
}

.child:nth-child(2) {
	flex-grow: 2;
}