JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <header>
    <h1>Site Title</h1>
  </header>
  <nav>
    <div class="scroller">
      <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">Shop</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </div>
  </nav>
</div>

CSS

@import url(https://fonts.googleapis.com/css?family=Raleway:300);
* {
  box-sizing: border-box;
  margin: 0;
}

a {
  text-decoration: none;
}

body {
  background: #CFD8DC;
}

.container {
  width: 320px;
  position: absolute;
  margin: calc(50vh - 240px) 0 0 calc(50% - 160px);
  background: #1565C0;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  height: 480px;
  border-radius: 3px;
  overflow: hidden;
}

header,
nav {
  background: #f9f9f9;
}

header {
  height: 40px;
  box-shadow: 0 1px 7px rgba(0, 0, 0, 0.3);
  z-index: 1;
  position: relative;
}

header h1 {
  margin: 0;
  padding-left: 20px;
  font: 24px/40px 'Raleway', sans-serif;
}

nav {
  width: 100%;
  height: 30px;
  overflow: hidden;
}

nav .scroller {
  width: 100%;
  height: 60px;
  overflow: auto;
}

nav ul {
  height: 30px;
  -webkit-user-select: none;
  white-space: nowrap;
}

nav ul li {
  display: inline-block;
  width: 30%;
  text-align: center;
}

nav ul li a {
  font: 18px/30px 'Raleway', sans-serif;
  color: #aae;
}