style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Arial', sans-serif;
}

nav {
  overflow: hidden;
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  background-color: #1e1e1e;
}

nav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: .82em;
}