.zs-product-item:nth-child(4) {
  position: relative;
}

.zs-product-item:nth-child(4)::before {
  content: "NEW";
  position: absolute;
  top: 10px;
  left: 10px;
background: #c8a96a;
color: #ffffff;
padding: 6px 14px;
font-size: 12px;
letter-spacing: 1px;
  z-index: 10;
}