in content/assets/javascript/init.js [187:197]
function getDifference(card, popup) {
var cardDimensions = getDimensions(card),
popupDimensions = getDimensions(popup);
return {
height: popupDimensions.height / cardDimensions.height,
width: popupDimensions.width / cardDimensions.width,
left: popupDimensions.left - cardDimensions.left,
top: popupDimensions.top - cardDimensions.top
}
}