body {
  background-color: #f7f7f7;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

li {
  float: left;
}

li a {
  display: block;
  color: #292929;
  padding: 15px;
  text-decoration: none;
}

li a:hover {
  background-color: #f1f1f1;
}