JSFiddle - React, Tailwind, and code Playground

HTML

<header>
	<nav>
		<ul>
            <li><a href="#"><span>Home</span></a></li><li>
			<a href="#"><span>Work</span></a></li><li>
			<a href="#"><span>Information</span></a></li>
		</ul>
	</nav>
</header>

<div class="center"></div>

CSS

/************************************************
Site Name: 
Author: 
************************************************/

html {
  margin: 0;
  padding: 0;
  position: relative;
  min-height: 100%;  
  overflow-y: scroll;
}

body {
  font-family: regular, helvetica, arial, sans-serif;
  font-weight: normal;
  font-size: 18px;
  line-height: 1.4;
  text-transform: none;
  letter-spacing: 0;
  color: #111;
}

body, input, textarea, select, button {
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: subpixel-antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:hover {
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -ms-transition: all 0.3s;
  -o-transition: all 0.3s;
  transition: all 0.3s;
}

b, strong {
  font-weight: normal;
}

a, a:visited {
  color: #111;
  text-decoration: underline;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  -webkit-tap-highlight-color: transparent;
}

h1, nav {
  font-size: 18px;
  font-weight: normal;
  text-transform: uppercase;
  text-decoration: none;
  text-align: center;
  letter-spacing: 2px;
  background-color: transparent;
}

h1 {
  margin: 0 0 26px 0;
}

p {
  margin: 0 0 16px 0;
  background-color: transparent;
}

p a:hover, a:focus, a:active {
  color: #111;
  text-decoration: none;
}

h1 a, a:visited {
  color: #111;
  text-decoration: none;
}

h1 a:hover, a:focus, a:active {
  color: #111;
  text-decoration: underline;
}

.center {
    width: 500px;
    height: 500px;
    margin: 0 auto;
    background-color: green;
}

/************************************************
Header - Footer - Navigation
************************************************/

header {
  position: fixed;
  width: 100%;
  line-height: 55px;
  top: 0;
  left: 0;
  margin: 0;
  padding: 0;
  z-index: 9999;
  background-color: rgba(0,0,0,0.70);
}

/* Navigation */

nav {
  display: block;
  text-align: center;
}

nav ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

nav li {
  display: inline-block;
  padding: 0...