body {
  color: #ddd;
  background-color: #000;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

  font-size: 1.1em;
  margin: 40px auto;
  padding: 1em;
  line-height: 1.6;
  max-width: 960px;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

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