:target {
  scroll-margin-top: 80px;  /* adjust for navbar height */
}

figure.centered {
  text-align: center;          /* center everything */
  margin: 1em auto;            /* spacing */
}

figure.centered img {          /* scale is done locally */              
  height: auto;                /* keep aspect ratio */
  display: block;              /* forces caption below */
  margin: 0 auto;              
}

figure.centered figcaption {
  margin-top: 0.5em;
  font-style: italic;
  font-size: 0.9em;
  text-align: center;           /* ensures multiline captions stay centered */
  width: 100%;                  /* take full width of figure */
}