header {
  margin: 2em 0;
}

footer {
  margin: 3em 0 2em 0;
  border-top: 1px solid var(--border-color);
  padding-top: 1em;
}

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

figure {
  margin: 1em 0;
  margin-left: 0;
  margin-right: 0;
}

html {
  overflow-y: scroll;
}

figcaption {
  font-size: 0.9em;
  font-style: italic;
  margin-top: 0.5em;
}

audio {
  width: 100%;
  margin: 1em 0;
}

iframe {
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
}