<ul>
  <li><a href="/"><span>Main</span></a></li>
  <li><a href="/"><span>Me</span></a></li>
  <li><a href="/"><span>Offer</span></a></li>
  <li><a href="/"><span>Pricing and Promotions</span></a></li>
  <li><a href="/"><span>Classes</span></a></li>
  <li><a href="/"><span>Contact</span></a></li>
</ul>

ul {
  display: flex;
  padding: 0;
  margin: 0;
  list-style: none;
  background-color: #536453;
  border-right: 0.5em solid #ffcd74;
  border-left: 0.5em solid #ffcd74;
}
li {
  flex: 1 0 auto;
}
ul a {
  display: block;
  padding: 0.25em 1em;
  color: #fff;
  text-decoration: none;
  text-align: center;
  border: 1px solid #fff;
}
a:hover {
  background: red;
}