Hello there. Welcome back to this web development tutorial series. We have learned a few concepts so far and before we continue, let's review them by doing a quick test. At this point, you should have a html file, named my_site.html with the following code in it; <!DOCTYPE html> <html> <head> <title></title> <link rel="stylesheet" type="text/css" href="my_site.css"> </head> <body> <h2>NASA | JPL</h2> <h1>ON A MISSION</h1> <h4>PODCAST</h4> <p>A new podcast from NASA</p> <ul> <li>Arrival</li> <li>We Are the World</li> <li>Worlds of Wonder</li> </ul...