body {
    background-color: darkcyan;
}
h1 {
    text-align: center;
}
p {
    text-align: center;
}

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.active {
  background-color: #04AA6D;
}