#popupDetail {
  display:none;
  position:fixed;
  top:10%;
  left:50%;
  transform:translateX(-50%);
  background:#fff;
  padding:20px;
  border-radius:10px;
  box-shadow:0 0 15px rgba(0,0,0,0.3);
  z-index:9999;
  max-width:400px;
}
#popupDetail img {
  border-radius:8px;
  margin-bottom:10px;
}
#popupDetail #closePopup {
  float:right;
  background:red;
  color:#fff;
  border:none;
  padding:5px 10px;
  cursor:pointer;
  border-radius:5px;
}