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

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: #00008b;
}

    body {
        background-color: gray;
        font-family: "Courier New", monospace;
        font-size: large;
    }