/*
 * QR modules must remain square after responsive layout resizing.  Browser
 * smoothing creates grey edges which make a desktop display much harder for a
 * provisioning camera to read.
 */
.qr > img {
  display: block;
  height: auto;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
  image-rendering: pixelated;
}