Use Shapes to add a background colour to a design you created from scratch using Vistaprint's design studio.

In the design studio, click Graphics from the left panel.
Select the Shapes tab.
Click the square shape and drag it to the top-left corner of your design.
Click and drag the blue dots to expand the square shape to the edges of your design.
Click Colour from the toolbar to select a colour for the square shape
- Select one from the colour palette
- Select via eyedropper tool
- Specify a custom colour via the + button
Click Arrange > Send To Back to move the square shape behind all elements of your design.

Note: To change the existing background colour of a Vistaprint template or modify the overall look of your upload, use the Colour option.