body {
  align-items: center;
  min-width: 450px;
}

form {
  padding: 0 1em;
  max-width: 80%;
}

form .row {
  max-width: calc(100% - 2em);
  margin: auto;
  margin-top: 2ex;
}

form label {
  flex: 1;
}

form button {
  margin-left: 2ex;
}

form .help {
  color: #666;
  font-size: 0.8em;
}