関連ワード:  how to add background color in ppt    how to add background color in ppt slide    how to change background color in ppt    how to change background color in ppt slide    how to set background color in ppt    how to change background color in pptx    how to change background color in ppt table    how to change background colors in powerpoint    how to change text background color in ppt    how to change image background color in ppt