Nemohu centrovat ul

<ul class="nav">
            <li><a href="#">Najdi si hru</a></li>
            <li><a href="#">Jaký je náš cíl?</a></li>
            <li><a href="#">Kontakt</a></li>
        </ul>

.nav {
  margin: 0 auto;
  border: 1px dotted yellow;
  text-align: center;
  padding: 0;
}
.nav li {
  display: inline-block;
  color: white;
  padding: 15px;
  border: 3px solid #2E9FFF;
  text-align: center;
  width: 150px;
  background-color: DodgerBlue;
  font-size: 100%;
  transition: ease 0.5s;
  text-decoration: none;
}
.nav li:hover {
  cursor: pointer;
  border: 3px solid #2E9FFF;
  border-radius: 50px;
  background-color: #1a1a1a;
}
.nav li a {
  text-decoration: none;
  color: white;
}