In a form i add a notefield where that note field is used for showing image.when the form opens in main window the image size getting fixed when the image opens in pop up window it is not getting fixed.can anyone tell how to make a fixed size even in pop up window?

input.plain = "<img src=' https://www.smashingmagazine.com/wp-content/uploads/2015/06/07-functions-opt.jpg' height='300' width='1000'>";