/* The closing call's particle mark (js/story/case-mark.js): a canvas of its own, under the
   call's text, on the section's own ground (the clear is transparent). Decorative, and never
   in the way of the button: it takes no pointer events -- the cursor is read off the window.
   The mark is centred in the canvas, so where the canvas sits is where the mark stands. */
.cb-cta { position: relative; isolation: isolate; } /* the canvas's box, and a layer it can sit at the bottom of */
.cb-cta-mark {
  position: absolute;
  z-index: -1;      /* under the text, over the section's ground */
  inset: 0;         /* the whole screen: the mark stands where the landing's camera puts it */
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}