The Checkout theme settings control how the Checkout page looks before a customer confirms their order.
The recommended banner size is 2000 x 175 px.
Add a logo to the left, right or center of the form.
Insert image behind the form fields.
Place a background picture in the order summary page. Images sit behind the cart information:
Change the font of the text displayed on the Checkout page.
Display your text in a variety of colors.
Further online checkout options can be found in your admin settings and then selecting "Checkout".