html,
body {
  height: 100%;
  margin: 0;
}

body {
  font-family: "Helvetica Neue", "Helvetica", "Arial", sans-serif;
  font-size: 14px;
  line-height: 1.42857143;
  color: #333;
  background-color: #fff;
}

main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
}