Max Shop Cart system formatting is controlled by a CSS file. The CSS file is called 'fonts.css'  Being a text file, it can be edited with a text editor.  All the tags are documented in the CSS file. Here is basically what it says within the CSS file:

The header class is used for titles on the Max Shop Cart pages

The subheader tag is used on several pages for sub-headings.

The content tag is the main body text format

The contentsmall class is the same as content, except it's small text. It's used for the message under the Delete Products button on the products control panel. Same for the delete text on the order history page.

The contenthead class is the same as content, except that it has a background color. This is used for the header line on the products control panel and the order history page.

The contentbody class is the background color of the products control panel and the order history display.

The contentcart class is used to display the shopping cart. Here is where the color of the cart comes from.

The contentamount class is used to display the shopping cart amount. It has a background color different from the rest of the cart.

The headerwhite class is used on the Download page of the cart when displaying the box of information.

The checkadr class is used on the Pay by Check page to show the address of where the checks must be sent.

The error tag is used whenever an error in input is made, such as a bad email address, for example.

The helpcontent class is for the text of help windows. The helpheader class is used for titles on the help pages.