Text box TRANSPARENT BACKGROUND COLOR is selected from FORMAT SHAPE dialogue window. It can be opened using DRAWING TOOLS FORMAT TAB, SHAPE FILL button SHAPE STYLES group.
Selecting transparent parameters is performed with slider TRANSPARENT. For selecting color click
GRADIENT STOPS .
Image 1. Color without transparent
Picture 2. Transparent background color
TRANSPARENT BACKGROUND COLOR , steps:
SELECT TEXT BOX.
DRAWING TOOLS FORMAT TAB.
SHAPE STYLES group.
SHAPE FILL button .
GRADIENT option.
MORE GRADIENT option.
FORMAT SHAPE dialogue window.
FILL option.
GRADIENT FILL.
Select color slider .
For changing transparency use TRANSPARENCY slider.