JSFiddle - React, Tailwind, and code Playground

HTML

<div id="nav">
  <div id="clock"> <a href="#">
    <iframe frameborder="0" seamless src="http://www.zeitverschiebung.net/clock-widget-iframe?language=de&timezone=Europe%2FZurich"></iframe>
    </a></div>
</div>

CSS

#nav {
	background-color: #79bce0;
	width: 350px;
	height: 150px;
    border-radius:30px
}
#clock { 
    background-color: transparent; 
}