body {
  margin: 0;
  color: #1f1f1f;
  font-family: 'Noto Sans JP', 'YuGothic', 'Yu Gothic', sans-serif;
  font-weight: 400;
}

h1 {
  margin: 0 auto 40px;
  text-align: center;
  font-size: 1.75rem;
  letter-spacing: .1em;
}

a {
  color: #1f1f1f;
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  opacity: 0.7;
}