hey mate, I am making some youtube background for my client. But I haven't experience. So, I don't know the actual size of the background! Can you help me? Do you know the size and do you have any design to follow? Please someone help me... Any kinds of suggestion will be appreciated. Thanks,
The background area will resize with the user's browser window, so it might be best to use a seamless repeating background (helps load times as well). If you mean the size of a YouTube video, 320x240 is the default.
Are you meaning something like my background? Link: http://www.youtube.com/user/GFXDude2010 If so, what I did is create a background pattern of my image. I would recommend making a background such as a gradient fill 1280x720. Most monitors these days are rectangular, and will display a rectangular background better. The window size of their browser (i.e. Maximized or Restored) will also influence how much of the background they see, because the browser will resize it to fit.