html {
  scrollbar-gutter: stable;
}

figure {
  margin-block-start: 0;
  margin-block-end: 0;
  margin-inline-start: 0;
  margin-inline-end: 0;
}

figcaption {
  font-style: italic;
  text-align: center;
}

img {
  max-width: 100%;
}

body {
  max-width: 600px;
  margin: auto;
}

header {
  text-align: center;
  border-bottom: 1px solid gray;
  font-size: 2em;
  font-weight: bold;
  padding: 0.5em 0;
}