html, body {
    font-family: Georgia, serif;
    margin: 0;
    padding: 0;
    height:100%;
    background-color: azure;
   color: black;
  text-align: center;
}
nav {
  height: 100%;
  float: center;
  
}

nav ul {
  padding: 0;
  list-style: none;
}

nav ul li a {
  display: block;
  padding: 10px;
  text-decoration: none;
color: black;
   border: 2px solid black;
}

nav ul li a:hover {
  background-color: powderblue;
  
}