> Also if the author couldn't even get that simple HTML detail right then it potentially says something about the quality of his site's information. Perhaps. P

> Also if the author couldn't even get that simple HTML detail right then it potentially says something about the quality of his site's information. Perhaps. Perhaps is doing some heavy lifting here. I take it from the fact that the lectures are on Functional Programming that OP might not be a front-end developer and might not have the level of care needed for front end to compress the images in a way that renders nicely. So, Perhaps you ought not judge someone releasing their free teaching materials for a backend class on their front end development, when the site is a centered <div> with purely static elements. Perhaps you ought to slow down and do some critical thinking before being critical of others.