body {
  max-width: 850px;
  margin: 32px auto;
  padding: 0 20px;
  font-size: 18px;
  line-height: 1.5;
}
h1 { font-size: 32px; margin: 20px 0 8px; }
h2 { font-size: 24px; margin: 28px 0 12px; }
header p { margin: 0 0 20px; }
article { margin: 0 0 28px 24px; }
article p { margin: 8px 0; }
article p + p { margin-left: 16px; font-size: 16px; }
.submission-warning { color: #f00; }
@media (max-width: 600px) {
  body { margin: 20px auto; padding: 0 16px; }
  article { margin-left: 12px; }
  article p + p { margin-left: 8px; }
}