body {
  margin: 0;
  padding: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

h1 {
  margin: 4px 0 12px;
  font-size: 1.4rem;
}

.main {
  width: 100%;
  max-width: 560px;
}