h1 {
  flex-basis: 100%;
}

main {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
}

article {
  background-color: #fff;
  color: #444;
  min-width: 200px;
  max-width: 800px;
  margin: 20px;
  box-shadow:
    0 4px 8px 0 rgba(0, 0, 0, 0.2),
    0 6px 20px 0 rgba(0, 0, 0, 0.19);
  font-size: 16px;
  line-height: 150%;
  padding: 10px;
}

cite {
  display: block;
  text-align: right;
  margin: 20px;
}

cite::before {
  content: "- ";
}