html {
    margin: auto;
    align: center;
}

body {
    background-color: lightblue;
    width: 900px;
    margin: auto;
    align: center;
    text-align: center;
}

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

p {
    font-family: verdana;
    font-size: 20px;
    text-align: center;
}

table {
    align: center;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333333;
}

li {
  float: left;
}

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

li a:hover {
  background-color: #111111;
}