JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
   <div class="container">
     <img src="flower.jpg" />
   </div>
   <div class="header">
     <ul>
       <li><a href="default.asp">Home</a></li>
       <li><a href="news.asp">News</a></li>
       <li><a href="contact.asp">Contact</a></li>
       <li><a href="about.asp">About</a></li>
     </ul>
   </div>

CSS

#wrapper {
  position: absolute;
  background-color: white;
  width: 100%;
  height: 100%;
  top: 0px;
  left: 0px;
}

img {
  width: 100%;
  height: 100%;
  display: block;
}

.header {
  width: 100%;
  height: 100px;
  background-color: green;
  text-align: center
}

.header a {
  color: black;
  text-decoration: none;
  margin: 50px;
  padding: 10px;
  font-size: 40px;
}

ul {
  display: flex;
  flex-direction: row;
  justify-content: center;
  list-style-type:none;
}