/* ---------------------------------------------------------------------------
   Frame the model figures.

   On GitHub the README renders on a dark background, so the package's
   white-background plots stand out on their own. On the pkgdown site the page
   background is white, so those same figures blend into the page. Give every
   PNG figure a light frame + shadow so it reads clearly as a figure.
   Repository badges are SVG (or extension-less badge URLs), so they are left
   untouched.
   --------------------------------------------------------------------------- */
img[src$=".png"] {
  border: 1px solid #e4e4e7;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.16);
  background-color: #ffffff;
  padding: 6px;
  box-sizing: border-box;
  max-width: 100%;
  height: auto;
}