Thank you for your reactivity.
The image file (.jpg) is not the issue because it works perfectly when I place it in the header menu. I did not set up a server yet, so I can’t give you a link to get the image (but I can email it to you if you give me a mailbox).
When I put the code, I see only a little blue triangle on the top right and on the top left, and, about 1 cm. below, comes the framed big blue and purple fuzzy image you placed on the content of your front page sample.
The code issue is not a huge issue as I can use the header way to place the image, but I might use a slider later, and I thought it might have been easier to use your way (showcase front / advanced text).
Thanks,
Alain