Falling at the first hurdle (HTML + CSS)


I have just started the HTML and CSS Part 1 course. I have got past the 'type your name in the middle of the Heading tags successfully, but then for Page 2, I have tried typing at the very start of the document, and whenever I click everything disappears except for the localhost text! What am I doing wrong?


Could you post a link to the lesson, and the code?