That's because the border radius is being applied to this new, transparent border around the image, so you don't see it any more. However, if you set the border-radius high enough, it will round its way all the way through to the photo and will end up rounding your photo corners for you:
/* Round images displayed in the Lightbox */
.sm-lightbox-image {
border-radius:40px;
-webkit-mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC);
}
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http://www.sherlockphotography.org/Customisations/Lightbox-margin
Please check out my gallery of customisations for the New SmugMug, more to come!
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Please check out my gallery of customisations for the New SmugMug, more to come!