Click the more options button in the top right of the textbox and select Change background color.
Discover new colors from the color palette or enter the color code directly into the color box.
You can also use the Change background color option to alter the transparency of your textbox.
Open up the color palette and move the transparency bar to the left to increase transparency. If your textbox is in advanced grid, you can use this option to layer your textbox over other objects.
Helping users with visual guides and technical support.