.demo-document {position:relative;isolation:isolate}
.demo-watermark {position:absolute;z-index:2;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;pointer-events:none;user-select:none;overflow:hidden}
.demo-watermark img {width:clamp(90px,35%,180px);height:auto;opacity:.09}
.demo-watermark strong {font:800 clamp(42px,12vw,76px)/1 system-ui,sans-serif;letter-spacing:.14em;color:rgba(6,38,67,.12)}
.demo-document #receipt-qr,.demo-document [data-simple-qr] {position:relative;z-index:3;background:#fff}
@media print {
  .demo-watermark {position:fixed;inset:0;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .demo-watermark img {opacity:.12}
  .demo-watermark strong {color:rgba(6,38,67,.18)}
}