html { font: 20px sans-serif; max-width: 40rem; margin: 16px; padding-bottom: 48px; }
nav img { border-radius: 100%; }
main img { max-width: 100%; display: block; }

body::after {
  content: "";
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 32px;
  background: url("/pattern.png") repeat-x;
}