ul {
  text-align: center;
  font-style: italic;
  font-weight: bold;
  list-style-type: none;
  margin: 10;
  padding: 0;
  width: auto;
  background-color: #f1f1f1;
  opacity: 0.8;
}
li a
{
  display: block;
  color: #000;
  padding: 8px 16px;
  text-decoration: none;
}
li a:hover
{
  background-color: #555;
  color: white;
}