ul { /*makes it into one line*/
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333333;
}

ul li {
  float: left; /*makes the links horizontal*/
}

ul li a {  /* makes the links into blocks*/
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-style: sans-serif;
}

ul li a:hover { /*dictates the colour when you hover over it*/
  background-color: #111111;
}