body {
  background-image: url('../img/fuel_spill.jpg');
}

h1 {
  color: black;
  text-align: center;
}

/*Navigation Bar Begin*/
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333333;
}

ul li {
  float: left;
}

ul li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

ul li a:hover:not(.active) {
  background-color: #111111;
}

ul li a.active {
  background-color: purple;
}

/*Navigation Bar End*/