<div class="container">
<nav>
  <ul>
    <li><a href="/">Home</a></li>
    <li><a href="/about">About</a></li>
    <li><a href="/history">History</a></li>
    <li><a href="/penguins">Penguins</a></li>
    <li><a href="/contact">Contact</a></li>
  </ul>
</nav>
</div>

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 40px;
  font: 1.2em 'Open Sans', sans-serif;
  background-color: #fff;
}

.container {
  background-color: #ddddda;
  height: 720px;
  width: 1280px;
  padding: 20px 40px;
  position: relative;
}

ul {
  font: 1.5em 'Averia Serif Libre', cursive;
  list-style-type: none;
  margin: 0;
  padding: .5em;
  background-color: #fff;
  display: flex;
  gap: .2em;
  flex-direction: row-reverse;
}

ul a {
  text-decoration: none;
  padding: .5em 1em;
  display: inline-block;
  background-color: #374785;
  color: #fff;
  border-top-right-radius: .5em;
}

ul a:focus, ul a:hover {
  background-color: #f76c6c;
  color: #171717;
}