When I write a long text, the background is present only for the first part of it. I need a background for the entire text when I make it scroll. Thank you for you help.
Thank a lot for your answer. This problem is solved now. In fact, I was trying to apply a transparent (70%) background. So I did a 4×4 px in photoshop and used it as an image for background. Then I selected into “background image/content” the options Repeat Y and Attachement. Now the background remain at the appropriate size in relation to the text.