Change object transparency in Pages on iPad
You can create interesting effects by making objects more or less opaque. When you put a low-opacity object on top of another object, for example, the bottom object shows through.
Tap to select an image, shape, text box, line, arrow, drawing, or video, or select multiple objects.
For a drawing, tap Drawing, then drag the Opacity slider; for any other item, tap Style, then drag the Opacity slider.