body {
  max-width: 760px;
  margin: 32px auto;
  padding: 0 20px;
  font-size: 18px;
  line-height: 1.5;
}

nav,
h1 {
  text-align: center;
}

nav {
  margin-bottom: 24px;
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h2 {
  margin-top: 40px;
}

h3 {
  margin-top: 28px;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 24px auto;
}