h1, h2 { text-align: center; }

h2 { margin-top: 4em; }

#credits {
  max-width: 400px;
  margin: 0 auto;
  font-size: 20px;
}

#credits dt {
  margin: 2em auto 1em auto;
  text-align: center;
  font-weight: bold;
}

#credits dd { margin-left: 0; }

#credits dd > span { display: block; text-align: center; }

#credits dd ul {
  list-style: none;
  margin: 0 auto;
  padding-left: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}

#credits dd ul li {
  width: 50%;
  display: inline-block;
  text-align: center;
}