You can make any object more transparent or more opaque.
On your webpage, select the object or text box you want to change by clicking it (or Shift-clicking to select several objects).
If the Graphic inspector isn’t open, click Inspector in the toolbar at the bottom of the iWeb window, and then click the Graphic button.
Drag the Opacity slider, or type a new percentage in the Opacity field.
If you change an object’s opacity and then can’t restore the object’s fill color to 100 percent, it may be that the opacity was set to less than 100 percent in the Colors window. To fix it, select the object, click Colors in the toolbar at the bottom of the iWeb window, and then set the opacity in the Colors window to 100 percent.
Note:If you select a text box, the text and any color or image you may have added to the text box will be modified.