body {
    background-color:black;
    color: white;
    font-family:Tahoma;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: white;
  position: fixed;
  bottom: 0;
  width: 100%;
}

ul li {
  float: left;
}

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

ul li a:hover {
  background-color: grey;
}