<h1>Fluid-width Navigation Using display: table</h1>

<nav>
  <ul>
    <li><a href="home.html">Home</a></li>
    <li><a href="about.html">About</a></li>
    <li><a href="services.html">Services</a></li>
    <li><a href="products.html">Products</a></li>
    <li><a href="jobs.html">Jobs</a></li>
    <li><a href="contact.html">Contact</a></li>
    <li id="x" class="x"><a href="privacy.html">Privacy</a></li>
  </ul>
</nav>

<button id="btn_add">Add Item</button> <button id="btn_remove" class="d" disabled>Remove Item</button>
<p class="p">Demo by Dan Rose. <a href="http://www.sitepoint.com/">See article</a>.</p>

body {
  font-family: Arial, sans-serif;
  padding: 4px;
  text-align: center;
}

h1 {
  text-align: center;
  font-weight: normal;
}

nav {
  background: #f0f0f0;
  border: 1px solid #ccc;
  border-right: none;
  width: 100%;
  margin-bottom: 20px;
}

nav ul {
  margin: 0;
  padding: 0;
}

nav ul li {
  list-style: none;
  text-align: center;
  border-left: 1px solid #fff;
  border-right: 1px solid #ccc;
}

nav ul li:first-child {
  border-left: none;
}

nav ul li a {
  display: block;
  text-decoration: none;
  color: #616161;
  padding: 10px 0;
}

nav {
  display: table;
  table-layout: fixed;
}

ul {
  display: table-row;
}

ul li {
  display: table-cell;
}

.x {
  display: none;
}

.p {
  text-align: center;
  font-size: 14px;
  margin-top: 80px;
}

.d {
  color: #ccc;
}

@media (max-width: 430px) {
  
  nav {
    font-size: .8em;
  }
  
  nav ul li {
    display: block;
    border-bottom: 1px solid #ccc;
  }

}

var ba = document.getElementById('btn_add'),
    br = document.getElementById('btn_remove'),
    x = document.getElementById('x');

ba.addEventListener('click', function () {
  x.className = '';
  ba.disabled = 'disabled';
  ba.className = 'd';
  br.className = '';
  br.disabled = '';
}, false);

br.addEventListener('click', function () {
  x.className = 'x';
  ba.disabled = '';
  ba.className = '';
  br.className = 'd';
  br.disabled = 'disabled';
}, false);