laptop.css provides "laptop CSS for the modern world," which is to say, GIFs playing inside of monospace-typed drawings of laptops. There are three sizes: sm, classic, and lg.
Use laptop.css to automatically wrap an html img with an ASCII art laptop.
And they say there is no beauty in the world! Creator jjkaufman also has somewiggly divs for you.
P.S. if you want some high-quality images of "blank" gadgets such as laptops, phones and smartwatches, Facebook of all places has a set for download.