Hi wonder if you could add a transparent watermark incorporated on to the images via an .png file

If this could be done at a high z level to stop the unwise from stealing the images by simply right clicking ( i know this wouldn't stop the pro's and cache hunters)

i produced this css code which worked on the main gallery image, but cant get it on image preview /

img.pwsp___img {
content: '' !important;
position: absolute !important;
left: 0 !important;
top: 0 !important;
right: 0 !important;
bottom: 0 !important;
background: url(https://irp-cdn.multiscreensite.com/c985c62c/dms3rep/multi/kisspng-nfl-draft-watermark-clip-art-stamp-5ac82f995269b7.4579887015230688253376-37705a56.png) !important;
background-size: cover !important;
}

Would this be possible or is it all ready implemented :)