Changing the opacity of the element
For changing the opacity of the element, do the following:
1. Select the element and expand the Effects tool from the right toolbar.
2. Click the Plus icon and choose the Opacity effect from the left.
3. Adjust the opacity level to get the look you want.
4. You can uncheck the Display checkbox to hide the effect.
5. For removing the effect, click the Delete button.
6. Save the page when you're done.