body {
  font-family: 'Noto Serif JP', serif;
  margin: 0;
  padding: 0;
  background: #fff;
  min-height: 100vh;
}
body.nav-open {
  overflow: hidden;
}
main {
  max-width: 1200px;
  margin: 0 auto;
}
h2 {
  width: 80%;
  color: #eee;
  font-size: 1.5rem;
  text-align: center;
  background: linear-gradient(90deg, rgba(0,0,0,0), #3c3c3c 30% 70%, rgba(0,0,0,0));
  padding-left: 5%;
  padding-right: 5%;
  margin: 0.8rem auto;
}
main > :first-child {
  margin-top: 0rem;
  padding-top: 6rem;
}
section > :first-child {
  margin-top: 0rem;
}