<figure> elements a good amount of margin from Firefox and WebKit’s user agent styles.

figure {
  display: block;
  -webkit-margin-before: 1em;
  -webkit-margin-after: 1em;
  -webkit-margin-start: 40px;
  -webkit-margin-end: 40px;
}

See fiddle figure margin

This is a new style within the past year, as 3dtransforms use <figure>s for the panels of the 3D objects. The default margin was offsetting all the panels.

normalize.css already has the situation under control, setting figure { margin: 0; }.