This is my tree background. I used lighter opacity than specified in the lesson because the trees were too dark for my taste and I would if using them as a background for a full web page reduce the opacity still further. Text is a little difficult to read on them at the moment. I decided not to use the background-fixed property because although it is a nice effect I use the Firefox web browser and would in real life not see the effect. I prefer to avoid using browser specific effects like that.

My tip for the class is to be careful with backgrounds, particularly this type, because if you suffer from migraines then trying to read text against a background like this where the colours match the font too closely can cause problems and result in a day in bed for your reader.