Function artStyle

static/mobile/app.js:112–118

(card)

  return typeof url === "string" && /^https:\/\/[^"'()\\\s]+$/.test(url) ? url : "";
}
function artStyle(card) {
  const g = (card && card.gradient) || DEFAULT_GRADIENT;
  const t = card && safeThumb(card.thumb);
  return t
    ? `background-image:url('${t}'), ${g};background-size:cover;background-position:center;`
    : `background:${g};`;
}
function artLabel(card) {
  return card && safeThumb(card.thumb) ? "" : esc((card && card.initial) || "♪");
}