<ul>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
</ul>
body {
  margin: 30px;
  font-family: sans-serif;
}

ul {
  display: flex;
  width: 100%;
}

ul > li {
  flex-grow: 1;
  text-align: center;
  border: 1px solid #000;
}

a {
  text-decoration: none;
  color: #000;
  display: block;
  padding: 10px;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.