@media print {
  body * { visibility: hidden; }
  #receipt, #receipt * { visibility: visible; }
  #receipt {
    position: absolute;
    top: 0;
    left: 0;
    width: 80mm;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    color: #000;
    background: #fff;
  }
  #receipt .line { display: flex; justify-content: space-between; }
  #receipt hr { border-top: 1px dashed #000; }
  #receipt button { display: none; }
}