JSFiddle - React, Tailwind, and code Playground

HTML

<div id="banner">
	<div class="container">
        <div id="branding">
            <h1>Site Name</h1>
            <p>Your catchy slogan goes here.</p>
        </div>
        <div id="advert">
        	<div class="advert">
            	<h1>Your advertisement could be here!</h1>
            </div>
        </div>
    </div>
</div>

CSS

#banner {
	background: #C1CE96;
	padding: 0;
	margin: 0;
	width: 100%;
	display: table;
	height: 10%;
	position: relative;
}

#banner #branding {
	padding: 10px;
	float: left;
	display: table-cell;
	vertical-align: middle;
}
#banner #branding h1 {
	font-size: 1.5em;
	color: #484A47;
}
#banner #branding p {
	font-size: 1em;
}

#banner #advert {
	float: right;
	vertical-align: middle;
	display: table-cell;
}

.advert {
	width: 468px;
	height: 60px;
	background: #fff;
	border: 1px solid #484A47;
	text-align: center;
}
.advert h1 {
	font-size: 1em;
}