JSFiddle - React, Tailwind, and code Playground

HTML

<div id="top">
   some menu options here
</div>
<div id="frame">
    <iframe id="newsViewer" src="http://www.bbc.com"  frameBorder="0" border="0">Sorry, please enable iFrames to view this</iframe>
</div>

CSS

#top {
	background: rgb(249,249,249);
	position: fixed;
	height: 90px;
	top: 0px;
	left: 0px;
	width: 100%;

}
#frame {
	/*background:red;*/
	border-top: 4px dashed #eee;
	position: fixed;
	top: 90px;
	left: 0px;
	height: 100px;
	width: 100%;
}