body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

.directory {
  margin: 0 auto;
  padding: 10px;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
}

li {
  margin: 5px;
}

a {
  display: inline-block;
  padding: 10px;
  background-color: #f2f2f2;
  border: 1px solid #ccc;
  color: #000;
  text-decoration: none;
}

@media screen and (max-width: 600px) {
  a {
    padding: 5px;
    font-size: 12px;
  }
}