JSFiddle - React, Tailwind, and code Playground

HTML

<nav class="navbar">
	<ul class="nav">
		<li><a href="index.html">Home</a></li>
		<li><a href="nutrition.html">Nutrition</a></li>
    <li><a href="grooming.html">Grooming</a></li>
		<li><a href="training.html">Training</a></li>
		<li><a href="contact.html">Contact</a></li>
	</ul>
</nav>

CSS

.navbar {
 background: #7d7e7d; /* Old browsers */
background: -moz-linear-gradient(top,  #7d7e7d 0%, #46ddc9 8%, #0e0e0e 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#7d7e7d), color-stop(8%,#46ddc9), color-stop(100%,#0e0e0e)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top,  #7d7e7d 0%,#46ddc9 8%,#0e0e0e 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top,  #7d7e7d 0%,#46ddc9 8%,#0e0e0e 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top,  #7d7e7d 0%,#46ddc9 8%,#0e0e0e 100%); /* IE10+ */
background: linear-gradient(to bottom,  #7d7e7d 0%,#46ddc9 8%,#0e0e0e 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#7d7e7d', endColorstr='#0e0e0e',GradientType=0 ); /* IE6-9 */ 
}
.navbar ul {
  list-style: none;
  padding: 0;
  margin: 0;
  background: transparent;
  overflow: hidden;
}
.navbar li a {
  float: left;
  line-height: 50px;
  padding: 0 20px;
  text-decoration: none;
  color: #ddd;
}
.navbar li a:hover {
  background-color: #333;
  color: #fff;
}