body {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif,
    "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  padding: 0 1rem 1rem 1rem;
  max-width: 680px;
  margin: 0 auto;
  background: #fff;
  color: #333;
}

li,
p {
  line-height: 1.5rem;
}

a {
  font-weight: 500;
}

hr {
  border: 1px solid #ddd;
}

iframe {
  background: #ccc;
  border: 1px solid #ccc;
  height: 10rem;
  width: 100%;
  border-radius: 0.5rem;
  filter: invert(1);
}