html,
body {
  margin: 0;
}

article {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

main {
  flex-grow: 1;
}

header {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  margin-top: 2em;
}

main {
  flex-shrink: 0;
  margin-top: 2em;
}

footer {
  flex-shrink: 0;
}

em {
  font-size: 1.5em;
  font-weight: bold;
  font-style: normal;
}