JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bg-rect" id="bg-rect-important">
	<div id="base-rect-lime"></div>
</div>

CSS

#bg-rect-important {
    background-color: #656565;
    width: 100%;
	position: absolute;
	left:0; right:0;
	min-width: 980px;   /* max for iPad */  
	height: 263px;
}

#base-rect-lime {
    background-color: lime;
	height:400px;
	width:940px;
	position: relative; 
	margin: 0 auto;
	left: -300px;
}