html {
  color: #1f2933;
  background: #f7f8fa;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  line-height: 1.75;
}

body {
  box-sizing: border-box;
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 24px 72px;
}

main {
  background: #ffffff;
  border: 1px solid #e1e4e8;
  border-radius: 8px;
  padding: 40px;
}

h1,
h2,
h3 {
  line-height: 1.35;
}

h1 {
  margin: 0 0 24px;
  font-size: 2rem;
}

h2 {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid #e6e8eb;
  font-size: 1.35rem;
}

h3 {
  margin-top: 28px;
  font-size: 1.1rem;
}

p {
  margin: 16px 0;
}

ul {
  padding-left: 1.4rem;
}

li {
  margin: 8px 0;
}

a {
  color: #0b63ce;
}

@media (max-width: 640px) {
  body {
    padding: 24px 14px 48px;
  }

  main {
    padding: 24px 18px;
  }

  h1 {
    font-size: 1.6rem;
  }
}