/*
 * pdf.js appends this canvas to <body> to measure text while building a page's
 * text layer, so it cannot be nested under the viewer's selector. It zeroes the
 * canvas itself once it has measured something, but a text chunk with nothing
 * measurable leaves it at the 300x150 canvas default long enough to render.
 */
.hiddenCanvasElement {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  display: none;
}